Hi I've Been Feeling Under The Weather For Two Weeks.

Hi I've been feeling under the weather for two weeks. I'm a teacher so I'm around a lot of sick kids this time of the years. I've never felt this horrible for this long. I'll rest and sleep all weekend and the moment I do anything that exerts energy I feel terrible again.
My symptoms are
Achy body
Head neck pain
Fatigue
Ast liver enzyme 53
Weird taste in my mouth
Mono was rules out
I feel terrible and I can't seem to kick it!