Seen a neurologist? You say you got MRI for the back, does that mean the neck? Personally, I'd go see a neurologist to look for tumors and I'd be looking at the cervical spine looking for pinched nerves. EMG tests are notoriously unreliable except to rule out certain diseases, but they really aren't very good at finding nerve pinching. Found that out from my pain specialist after I got one, much to my irritation. I'm no expert here, and can't say, but when that much is going on you have to keep looking for the answer until you find it, which often means looking for more gifted specialists than the ones in your area. Peace.