In my opinion, it is possible that pregabalin is contributing to your physical changes, as one of the side effects is pruritis (itching). On the other hand, weight gain is another side effect. Primarily pregabalin is an anticonvulsant, but another side effect of the drug is drowsiness – which presumably, is the desired effect for you. Perhaps you could talk to your doctor about trying a different sleep aid, like zolpidem (Ambien) or diphenhydramine. He or she might be able to suggest some non-drug solutions as well – like exercising before bedtime. As a side note, for some people, hops are a remedy for insomnia. Some clusters stuffed in your pillow might help with your restlessness as well. As always, talk to your doctor first! Best wishes. – Soar