I wanted to answer this even though it is an older post. I was getting an epidural steroid injection every time I visited my neurologist for back pain radiating down my leg. The injections did work; but I remembered a drug called Baclofen which is somewhat different than your everyday muscle relaxer. It is more of an antispasmodic. I started taking it and my quality of life has improved 100%. Depending on the origin of your pain, this might help. It isn't such a strong drug that you couldn't just give it a try at a low dose and work your way up if you are getting some relief. Pain with MG is real and should be given thoughtful consideration. Quality of life is a very real issue.