Lyrica has been known to put weight on women -- it's one of the side effects.
Lowering the dose will lose the effectiveness.
Switching to an antiseizure med may help but may not. There are a few available.
Lyrica is effective, as you've proven. I feel it is more important to treat your pain, and to find other means to keep the weight off, then live in pain and 'float like a butterfly.'
That's my opinion, but I deal with pain. Perhaps a weight-loss person would support the opposite opinion?
Best wishes
I actually meant Topamax woops :)