I am going through the same thing right now. As a child, I had severe meltdowns almost everyday. Back then as with every disabled child I was diagnosed with ADHD but as an adult nobody tells me I act like I have adult ADHD. Anyway my other main symptoms are bad social skills and obsessing over certain topics.
I have had mental health professionals including both tdocs and pdocs that thought I was on the autism spectrum, but they all say that nowadays I'm not disabled by that, instead my severe bipolar/schizoaffective is the focal point of all my treatment.