I'm not very trusting of medications myself as I've had a few adverse reactions in the past.
I've heard mixed reviews on the Gabapentin for pain from members of a psoriatic arthritis group I belong to. I guess it's like anything else, meds work differently for everybody, some have good experiences, others not so much.
I do hope you are able to find some kind of relief from the pain though ...
Living in constant pain sucks BIG time!