panic disorde
"I used to take Paxil and I hated the side effects, and the withdrawal effects, like brain zaps.  Because of this, I don't want to try another SSRI. So my doctor had me try Buspar.  I was hopeful at first. I knew it affected serotonin, but without the withdrawal effects.  

Well.  The first 5 mg dose I took brought on a gigantic round on brain zaps for 1.5 hours, the same kind that I'd had in Paxil withdrawal, but much worse. It was so bad that I could barely walk.  Every time I moved my head or neck, I'd get a bunch of zaps in a row.  Very disorienting.  I gave it a week and a half to see if the zaps would dissipate, and they didn't.  My doctor said to stop the Buspar because if the zaps haven't stopped by now, they probably won't."