I've just been prescribed Gabapentine for a trapped nerve. Googling has really rather worried me - so many side-effects! Particularly worried about the psychological side-effects:
Common (1% to 10%): Abnormal thinking, amnesia, depression, hostility, confusion, emotional liability, anxiety, nervousness, amnesia, insomnia
Uncommon (0.1% to 1%): Mental impairment
Rare (less than 0.1%): Hallucinations 
Frequency not reported: Suicidal behavior and ideation, hypomania[Ref]
I have a history of depression, and only came off ADs a few months ago.
Beginning to wonder whether it's worth the risk. Maybe I can just live with the pain (and Naproxen plus Omeprazole) until it settles down or gets treated.