I have been on neurontin and now on lyrica and haven't put on weight. I wouldn't know if it is due to the product itself or predisposition to weight gain when it comes to medication.

I agree with dagm131, what is-are the cause of your pain would help in giving or sharing our own experience and telling you what has helped us.

Will look back on your post again when you will have given us more details.
Till then, wishing you a good night sleep.