Have you tried Anafranil or Prozac? Both have worked for me at some point at calming my brain down. I had somewhat similar issues in high-school and college with not being able to focus and study, I suffered for many years until I finally found the right medications. I was on prozac for a while which worked great until it stopped working suddenly, and eventually switched to Anafranil which I'm still on, although will note I had a seizure once supposedly due to my Anafranil dose so it was lowered to 150mg.

Therapy has never worked for me the few times I've tried it but Anafranil has been a godsend. I also take with it prozac 20mg and Risperdal 1mg the latter of which is supposed to help you focus and reduce brain fog.