OP is lucky that they didn't get hurt, too. "Acid" often isn't LSD--it's often other psychedelic drugs like NBOMe's, that have a narrow window between a physiologically safe dose and a dose that can cause cardiac arrest, internal bleeding, gangrene of the limbs, and other nasty things. It's naive to buy acid and trust the dealer that it's LSD and that the dose is 100mcg--even if the dealer truly believes it! They probably bought it from another dealer, after all.