Anaesthesia.
The first time I was 'put under', when I woke up, I was completely fine: knew I had an operation, the operation was done, blah blah blah. But the second time...!! :scared
I thought I was reliving a flashback from when I had amnesia, and they were about to do surgery on me when I was still AWAKE!! Needless to say, I was crying, babbling, moderately freaking out, and - I didn't know this could create this - freezing! I was shivering uncontrollably as I repeatedly called for my mom, to try to make 'sense' of the situation I was in, and, the shivers, were from adrenaline. I never knew you could get cold (- shivering -) from adrenaline. Hmm. :huh
Well, anyways, that's my bad experience withdrawing from drugs, though usually, I have to take strong drugs just to STOP my frequent headaches. :umm:
Don't know if this counts, but that's my experience. Every time you're anesthetized, you have a different reaction I was told. So... yeah. :stickout