Rach, Well, that "bit" of history now makes me wonder about your O2 stats. Could you have stenosis somewhere of an artery? With all that surgery, I have to wonder. And then there's the kidney infections. Maybe there is renal artery stenosis. I think you'd better get yourself to a cardiologist too.
O2 stats do fall late in the game with MG so their being in the 90's can be deceptive. It's better to go by how you are feeling.
I'm sorry you have other stuff going on. I imagine that is very scary. I hope someone over there can figure this all out for you.
Annie