Yes, that was what I was thinking.

It seems that I am seronegative. SFEMG can't be done, because here in Netherlands they ONLY do SFEMG on the eyes.

And as I don't have droopy eyes, the expert says it can't be MG. That is even though I respond very well to even small doses of Mestinon.

It occurred to me that I may simply have a low level of Acetylcholine. I have always tired quickly, and lacked stamina, even as a child. But since there is no test for it, and no chance that the Health service here is going to agree to look for CMS, I am kinda stuck.