ibromyalgia
"I was prescribed Lyrica (pregabalin) about 6 months ago. I was so shocked by the feelings of unreality it initially caused that I quickly stopped taking it. My fibromyalgia got so bad at the end of the year, that I decided to try it again. 

I take low doses, 25 mg 2x a day, sometimes a 50 mg. The effect sets in within hours. My fibromyalgia pain is almost completely gone. A late evening dose allows me to sleep longer.

I do feel strange when I take it and my intellectual capacity is quite affected, but the lack of distraction by the pain and a better social interaction with increased confidence levels makes up for that.

I have to make sure that authorities and decision-making bodies are aware of my reduced competence, and close friends should know of these side effects, so that they can make allowances for any out-of-character behaviour on my part i.e. my inability to repair their car stereo."