I find the Neurontin (gabapentin) pretty helpful, especially for nerve pain.
You mentioned you'll take 300 mg three times a day. One thing my doctor did which I really like is he wrote a prescript
ion for 100 mg tablets of Neurontin. That way, I have some flexibililty in taking it. I'm one who doesn't need many mgs of meds for it to help (usually, unless it's a really bad flare).
Maybe next time you need a refill, you could ask about
the 100 mg tablets versus the 300 mg and see if he would be okay with your taking it that way. Less tiredness and less fog are a plus! I do sometimes still take 300 mg, though, if my pain is especially bad.
I've never gone to the ER with fibro pain, though a few times I was tempted to, when my headaches were especially bad.
Hope things are better soon!