Baclofen
"I have an undiagnosed muscular condition coupled with JRA and borderline personality disorder. I only just started baclofen a week ago, 10mg 3x a day. I don't think  I've ever NOT felt pain-- it's amazing. My pain level was so high all the time and it helped with the overall/daily pain as well as the cramping. Only downsides being that I appear to have side effects like dizziness, confusion, balance problems, and worsening psychotic symptoms. I've experienced some low-level hallucinations/spatial distortions (floor looks like it's moving or the walls are breathing) which is more confusing that concerning. Only downsides to this medicine besides sleeping (which I love as an insomniac)!"