I was pretty sure it’d be Myesthenia Gravis but they fooled us. But, certainly, as good and knowledgable of a doctor Daniel is, he MUST have some inkling of what it could be. He’s talking doom and gloom before he even knows what he has. Too much proximity to Sami maybe.
I don’t know why he’d have to give up on surgery as long as he has an assistant surgeon by his side to take over if necessary. That assistant should be just as qualified as Dan and be able to finish anything Dan can’t/couldn’t. At least until he knows it’s something that’s going to get worse or be permanent. Then he could join everybody else and go teach at Salem U.