I have been on Gabapentin for 1 1/2 years slowly increasing to 3300 mg a day till I got relief from cranial pain middle left on the scalp. It took me a long time to get used to, felt tired and dizzy and very bad in the late afternoon. No swelling or urinary problems. I also take an anti depressant for the same condition. Still have pain but is more controlled. Everyone is different . You have to experiment with many drugs its unfortunate but life is worth living.