Have you ever discussed taking Lyrica for your fibromyalgia with your doctor? I took it for a couple years and it did help my pain but we recently DCd it because I have frequent dizziness and that is a common side effect of Lyrica.
Neurontin may/may not help with fibromyalgia. Not giving advice here but just suggestions to mention to doc.
Even though it hurts light exercise will help fibromyalgia. Perhaps you could start with some simple stretching exercises.
I relate to your fear of not getting better. About five or six years ago I asked my psychiatrist if this is as good as I am going to get. She said she didn't know. I appreciated her honesty. Fortunately with the passage of time and trialing new drugs I have made significant improvement and have not been severely depressed or manic since 2007. Hang in there. It is so frustrating when you want to feel better but can't.