Well I made another post with some work / school coping mechanisms tools that I've found helpful.

I was diagnosed as a kid, got help in school but wasn't on meds. In grad school I got rediagnosed- did the whole 5-6 hr testing thing. I needed to do that to get access to certain resources.

A lot of the testing is questionnaires that you fill out. If you are an anxious person who tends to over think and are self-conscious, it might feel difficult to fill out accuratly. I had a hard time translating my issues into all the questions.

If you have other mental health issues it's complicated too. But some people test more clearly than others. It may make you feel better to test- you might feel validated and more clear.

Psychiatrists will often diagnose you just on their assessment, if they are going to prescribe you drugs. You don't have to do the full testing if you don't want probably- and it's expensive so it depends on your insurance.

I think diagnosing could give you clarity, validation, and access to some treatment options (like meds). But you may not need / want those things if you feel pretty clear on your issues and are getting the help you need. It is also possible you will go through all the testing and just be more frustrated.

As for meds, a lot of people use stimulants. There are some other medications to. Stimulants made me anxious for the most part. I don't take them now. I take an ssri currently which helps with anxiety, and helps ADHD sort of indirectly. Some people feel much better on stims. Sometimes I wish I could take them so I could just calm down and focus, but it's not worth messing with the anxiety right now.

Everyone is different and it partly depends on what issues you think ADHD might relate to and what you want to get out of a diagnosis.

Hope that helps...