Why did this happen to me? (see details)?

i went to a rave with some friends and decided to divulge in a little LSD action at about 11:00 pm, but it was fake because i didn't trip. as the night wore on i grew more tired until i was yawning and ready to go to sleep. at about 4 am we began our walk back to the El station just over a mile away, but one block into it i noticed a tingly, prickly sensation in my fingertips, my eyelids seemed to force themselves shut and i could barely feel myself walk. at the worst point of the endeavor my hands had lost all circulation and had clenched into a truly bizarre position, i could not open my eyes nor could i walk, and i had severe difficulty breathing. i've been to many raves, taken a good amount of drugs and never experienced anything as unpleasant as this so.... why the F did this happen?