Yes.
It would be rare, but possible.
There are signs on a RNS that would be present in LEMS, but not MG.
There are blood tests for LEMS they can do.
Drink more water and increase your fiber for the constipation. Flax seeds help, quinoa, more veggies, etc.
Sorry to be short, but I don't have a lot of time today.
Anyone else have any input (please)?
Annie