Get screened for whatever you think you've got. Think you've got ADHD? Go get an ADHD screening. Autism? It's not easy to find a psych who does adult Autism screenings, but they're out there. OCD? You get the idea.

Regardless of whether the conclusion is "yes you have x" or "no you don't have x" the diagnosis will be accompanied by a detailed analysis of your psychological condition. Whether or not you are diagnosed, that analysis will cover the issues that led you to believe you may have that condition.