Celeste, I'm sorry you are having to face down the unknown. I really hope it isn't cancer. If it ends up being small cell lung cancer, then, obviously, you should be re/tested for LEMS.
When I was at the dentist recently, the nurse said that her Mom had LEMS and had a very successful removal and radiation of the lung cancer. It isn't always a doom and gloom situation.
It's sort of funny how they'll gleefully tell you that you're fine and everything was negative but act like a CIA Op when it's not.
Sending positive thoughts your way! Try to do something nice for yourself in the meantime. Stress never helps.

Annie