Its strange the ENT DRS didn't do any biopsies surgery...
The mucoepidermoid CA is not common in people. I think yours high grade by the time the doctors diagnosed it? I also had high grade mucoepidermoid CA before two years the sublingual salivary gland, but the radiation treatments and side effects are the same for everyone!
As i understand with my team at Moffitt CA Center and my RO here is chemo which not used with this type of cancer as it does not respond to it.
As everyone suggested to make sure you are getting plenty of fluids and calories and protein! Supplements are great-- protein powder, ensure, boost, carnation.