maybe you did take alot , and im pretty sure that was your peak ..
i had a very similar experience to yours.. i dont know what you may call it but pretty much what happened to you..but more intense
i was at a festival and had too much of a really good strong pill (tested , very strong results ) i took about 2 n 1/2 (im a girl thats pretty skinny) and when all those pills hit me , i was outta it .... i started shaking my legs where NUMB,i was losing coordination ,my eyes where also shaking really hard i was hot i was thinking crazy stuff like i wanted to jump off the ledge into the water (it was by a little rive ),that it was too much and that i was gonna die!! i took way too much i was a rookie and being stupid JUST LIKE YOU lol .. thank god my bf was there and he is very experienced and walked me through it , he got me ice so i wouldn't eat my lips and also put it on my body to cool off , laid me down and talked me through the peak it only lasted about 10-15 mins and after i felt AWESOME and then came really down
i was scared as shit after that i freaked out , but about 4 years later and lots of rolls after , i know wish i could get that high i would obviously handle it differently, but i was rolling HARDDDDDD lol
and i have never came across pills that strong again it was also my b day that day , so i guess i was being wreckless..
dont worry your fine .. dont let your mind freak you out , you have to get over things as such and learn from them.. dwell on it see were you went wrong with dosing and next time you know better.. btw your brain is fine!