I am going to add my experience in here.
I took gabapentin for several weeks at one point years ago, and had no result from it whatever, nothing good, nothing bad.
I started taking Pregablin (Lyrica) about three months ago. My doctor prescribed it for me to take in the morning and also at night.
At first I only took it at night, and it did seem to make my sleep better, meaning deeper and maybe I slept longer. But more recently it has not seemed to be helping with sleep at all, and my sleep has been very poor for the past couple of months. I had some serious stress over this summer, so it might be attributable to that, and I am going to continue taking it at night to see.
I started recently taking it in the morning as well, because I am having so many terrible days I need something that changes that even a little bit.
So far, I think it is helping enough that it's worthwhile for me to continue taking it and see how it goes. I am actually able to get things done when I take it. Anything that helps is terrific for as long as it helps.
It sure hasn't made me gain any weight! But if it did, I'd be so glad because my problem is that I am way too thin.
Everyone's different, and how drugs affect any given individual is not predictable,
so one cannot ever say that this or that drug is good or is bad or works for everyone or doesn't ever work.
I may not continue to like the pregablin, but as with everything about fibro I am taking it one day at a time and I will see.