I started on a low dose of gabapentin a couple months ago (100mg then 200mg twice a day) and didn't have any problems with it...not sure it was helping the pain either. This last week my legs decided the didn't want to work (hips and knees feel like they're trying to swivel) and the muscle spams started. My doc increased my dosage to 400mg then 800mg twice a day. I took 800mg this morning about 10:30 with no problem. Around 2:00pm I started feeling dizzy, my legs were worse, it feels like tiny muscle spams all over inside, and it feels like there's a pressure all around me...it's a weird feeling. I take gabapentin only twice a day because I'm on Xyrem at night and they can't be taken near each other. So do you guys think it could be the gabapentin or just RSD acting up?