man thats some really fucked up shit to hear i cant really tell you what happend but my cuz twiches like a mofo when hes high if i were you i would ask your friend who you bought it from and make him tell you what the fuck was in it and if he says it was reg weed tell him to smoke one in front of you. but since you got a normal high for a while my only guess is that you had a very bad reaction to it and maybe it was the type of weed?