Hi Melissa. I'm so sorry. Yes, all of your symptoms are familiar to us here. And common. It doesn't mean you have MG, but I think it's shameful that three years later you still don't have a diagnosis. You need to be treated. Without a diagnosis, and a clear determination that you have AChR binding antibody, a doctor does not know how to treat you. Let me just give you some facts as I understand them.
1) It doesn't matter how much bad antibody you have in your blood. The level may change constantly for no evident reason and continued testing is unnecessary. The right amount of AChR binding antibody is pretty much zero. It is something a healthy immune system does not produce.
2) Pyridostigmine is also diagnostic of AChR positive MG. Have you tried it and what were the results? Pyridostigmine was a miracle drug for my AChR positive MG. It doesn't work for MUSK and may even make it worse.
3) If you have MG, a delayed diagnosis may result is continued destruction of neuromuscular receptors, a growing risk of a Myasthenic crisis, and the risk of being treated with certain antibiotics and live vaccines that pose a danger to you.
It's time to get mad. We've all been through this pre-diagnosis hell, and we're all on your side. It shouldn't take a crisis to get your doctor's attention. Unfortunately, for many of us, it did. Hang in there.