Switching thoughts within seconds

[u/MegzyStar]

Every once in a while I suddenly get thoughts that jump from one topic to another in my head. It goes so fast that I can't even comprehend what I just thought. It gets to the point my head feels like it will explode, and I need to scream in a pillow. This only started with in the last year. I can't figure out if it's autistim or ADHD. I asked my therapist but she looked like I have no idea what you're talking about. She never gave me a real answer. Does anyone deal with something similar to this? If you do, do you know how to control it or deal with it?

[u/ConvexLex]

That sounds like racing thoughts, but a therapist should easily be able to identify that so maybe I'm missing something.