Weight gain with Gabapentin is listed as a rare side effect. Perhaps try a low dose at night time. It can be addicting, but I think it worth trying to see if it helps. You shouldn’t have issues stopping it if you find it doesn’t help, or if you gain weight or suffer from other side effects. I’ve talked with my neurologist about it, and if it works for you it often has fewer side effects than some of the other drugs.

That being said, as with all drugs, people react differently. It’s a matter of finding which medication works best for you.