So, the obnoxious thing about the psychiatric diagnostic system is that, while each condition is theoretically a distinct medical problem, they are diagnosed based on symptoms, not biological factors. Actually, whenever possible, they base it on the resulting behavior, rather than actual symptoms experienced by the patient. Depending on how you present or how you describe the problem, they may misunderstand what symptoms you even have! Further, there's some overlap in the symptoms/behavior of each condition, so if you have three problems, you'll probably meet the diagnostic criteria for at least five conditions.

So, here's various thoughts that occurred to me from reading your post:

Your description of the hallucinations makes me wonder if it's not psychosis but actually intrusive thoughts? It's common with primarily obsessional OCD, but it can be a result of other conditions too (including regular OCD).

You mentioned schizoid personality type. Do you mean introversion? (Introverts just like a lot of solitude. They like interacting with people too, just in smaller amounts than some other people. Interacting with others can be exhausting in large amounts, while solitude is refreshing. Introverts are probably more likely to have hobbies they can do by themselves.) I've noticed that many introverted people end up with the idea that something is horribly freakish and wrong with themselves just because they are introverted... even though it's an incredibly normal personality trait with about 50% of the population being introverted. (It seems like they get their anti-introvert ideas because their parents or other important people in their childhood were extroverted and criticized them for having introvert preferences.) Shyness, social anxiety, and schizoid PD all involve some degree of fear; they can occur with or without introversion. If you feel like introversion is a problem and describe it to the mental health folks like it's a problem, they might start thinking along the lines of schizoid PD.

Even though the diagnostic criteria seems totally different, there is a tendency for ADHD to be really really similar the "high functioning" forms of autism spectrum disorder (and Asperger's syndrome). Since you (possibly?) have ADHD, consider anything I say about autism in this post to apply to you.

The word "empathy" can mean at least five different things, and those things get conflated stupidly often.

• If you don't care about other people's feelings at all (e.g. you would be okay with making some innocent person suffer if it caused some kind of material benefit to you, and you wouldn't even feel bad), that's sociopathy.
• If you have trouble (greater difficulty than most people have) identifying other people's current emotions based on their facial expression, tone of voice, etc, that's totally different from sociopathy. It's a common issue with autism (and therefore ADHD) and social pragmatic communication disorder.
• If you have difficulty (greater difficulty than most people have) imagining other people's point of view, that also seems kind of autism-related.
• If you accidentally do mean things because you go from idea to action without stopping to realize it's a bad idea, that's an impulse-control issue, probably from ADHD.
• If you feel annoyed when someone is complaining incessantly about some issue that you can't sympathize with, that's probably normal.

Sometimes this confusion causes weird ideas like "trouble identifying other people's emotions = effectively evil," even though that makes no sense.

I'd consider anhedonia a symptom or feeling rather than a condition or diagnostic label. It's when you're so sad or apathetic (or angry) that you can't enjoy anything and therefore aren't interested in anything. If you lose interest in things you used to enjoy but you also become interested in new things around the same time, that's practically the opposite of anhedonia, and it's a common problem with ADHD. (Having ADHD myself, including this issue of frequently changing interests, I suspect my problem isn't actually that I lose interest more often than most people but rather that I have trouble persisting on projects after the initial enthusiasm has worn off.)

Difficulty with boredom, plans, and over-confidence are potentially all related to ADHD.

If you've had several bad experiences with other people in certain situations (prank dates and cheating), it can cause some social anxiety or trust issues regarding similar situations. (It's the same way punishment works, except worse. Or, the same way PTSD works, except probably less bad.) Not sure if they'll even want to give you an actual diagnosis for that, but I believe social anxiety disorder can apply to certain situations only, even if you aren't anxious in all social situations.

I'm not diagnosed with anything accounting for this, but I have symptoms along the lines of the hypersensitive variety of sensory processing disorder (which is not recognized by the American Psychiatric Association or in the DSM). These symptoms used to cause me some severe rage issues. Nowadays, my coping techniques keep the anger at controllable levels or non-existent, although I still have other difficulties from the symptoms.

Here's some examples of dumb questions that sometimes occur on psychiatric screening questionnaires:

• "I have little to no interest in things that I used to enjoy." - This is trying to identify anhedonia (not having interest in anything). If you have switched to being interested in other things, it doesn't really apply.
• Things like "I feel hopeless" or "I believe that I will fail at almost everything I try" or anything related to being sad - This will get associated with depression, even if you are saying yes because crippling executive dysfunction (ADHD) is making your life stupidly difficult.
• "I sometimes hear or see things that others don't hear or see." - This is trying to identify hallucinations/psychosis, not to be confused with noticing existent things that other people don't notice.
• "I sometimes vomit after I eat." - It means deliberately. If you have some kind of gastrointestinal issue that makes you vomit when you don't want to, that doesn't count.
• "I [do some activity] more than I should." - This will get flagged as some kind of issue or addiction related to that activity, even if you have executive dysfunction (ADHD, autism) or other issue that causes you to do various things more than you should.
• "People talk about me behind my back." - If you believe those people talk about everyone behind their back, it probably doesn't count.

Some questionnaires were made a long time ago and might reflect older values or language choices. For example, when I read the NPI-40 (narcissistic personality index, for measuring narcissistic personality disorder ) I find myself thinking that most of the answers indicating NPD are common, non-pathological, and not really useful for detecting NPD.