Sciatica. Pain is not much but I get tingling in legs&buttocks when I sit for long. I cant walk for long or fast, legs burn. Doc prescibed gabapentin, is it addictive? Will sciatica cause permanent damage? Cant do any of my fav activities like swim/hike

Yes. it is addicting and a schedule V drug. It may help with neurological pain and numbness. Discuss with your Neurosurgeon the future management plan.
Gabapentin. is not a controlled substance and does not have withdrawal. Good if it works.
sciatica is from a nerve being attacked by something. The nerve can become permanently damaged. It is usually from a disk hitting the nerve.