I totally understand your frustration and concerns. This has been going on almost a year now for me and still no diagnosis.

It took a few months for the medication to fit right, experimentation is key. I am on Lyrica rather than Gabapentin, but its my understanding they do a similar thing. At first, Lirica was enough for me to control the pain, but I eventually needed some Tramadol as well. I hate being on such strong drugs. But, now that its sorted I wouldn't want to stop without good reason.

Being in control of the pain, rather than it controlling me, has given my life back.

Hang in there, soon the meds will kick in and you will get pain relief enough to function again.