Unfortunately what you've described could fit a number of conditions; bipolar disorder, histrionic personality disorder...the list goes on. That doesn't mean to say you have any of those things - you could in fact have one or more conditions in need of diagnosis. But here sadly is not the place to find out.

One thing that is common with most conditions is changeability - you won't necessarily have the same severity of symptoms, or even symptoms, as the days/weeks/months go by. The effect this has on an individuals life can vary - some people require the use of medication, others need behavioural modification. A lot of people need both. It's really down to the individual to decide what needs challenging and how to do it. Professionals are there merely to assist.

I hope you can find a reliable professional to adequately diagnose and treat you - as a rule of thumb, PD's take a fair bit of time to diagnose. Usually you have to be an adult too but perhaps you could put across the argument that as your symptoms have persisted and are unlikely to change in the near future, perhaps you can start some form of treatment now. Depending on where you are a diagnosis isn't necessarily required to gain access to treatment. Again this is something you'll need to discuss with your treatment provider. Good luck.