Gabapentin/Neurontin will not continue to increase your weight exponentially.
It will reach a max and level off, usually from 15 to 30 lbs., dependent on the individual. I gained 25 lbs in 6 mos and stayed there for 6 years then lost it on Weight Watchers. I then switched to Lyrica , & gained 30lbs - and stayed there for 3 years until I stopped smoking 4mos ago. I then gained more weight and am dealing with that, now.
But its a trade off. Compromises must be made.
15-25 lbs for significant pain control- or be in pain and thinner.
You can lose the gained weight, but it is an effort.
BTW - Dark, bittersweet chocolate has anti-oxidants
and in moderation, is good for you.