I went to the ER tonight because whenever I moved my arms in front of me I would bend over and it felt like the air was expelling from my lungs. The ER doc did some tests with my arms and when he asked me push downward I think or maybe it was upward against his hand I got a shooting pain in my back on the right side. The pain was actually worse after he did this. I've had this problem for many years but today I couldn't move without triggering this strange reaction. He was going to prescribe muscle relaxers for the pain, but I said it's not a good idea with MG, another ER doc overheard this and came over and said I should take Ibuprofen and prescribed me some Motrin. I used to think it was the trapezius muscle but I was told by the ER doc that it was Rhomboid strain. I'm wondering if the chronic problem with this muscle is due to MG or from something else. Is MG muscle specific? Why wouldn't it effect all the muscles in my back? I looked at an anatomy picture of where the Rhomboid muscle is and my pain is lower.