I was on 3600 mgs of gabapentin for about a year. I had been avoiding cymbalta and lyrica due to side effects I had read about.
After a more painful than normal stretch, I asked my dr to change things up. Im now taking 75 mg of lyrica and no gabapentin.

I never felt gabapentin did anything but make me lazy and tired. I have noticed improvement with the lyrica tho. It didnt change my life, but I seem to be leveled off in terms of pain. I guess that's better than nothing.

Reading these posts may have answered the question of why I've felt kind of nauseous lately.