Erin, just now noticed this post and yes, I too suffer pain in my left leg, and my left ankle pain is so bad that at night it wakes me up. In fact my whole left side is messed up. I do not have R/A and I have asked my Dr. about this and he said he will have to run tests {what else is new?} because he thinks it may be another illness. I remember when I was DXed with MG the Dr said there is no pain with it.. well I guess he was wrong because it seems everyone with MG suffers pain.