Now what?

So, for the past year or so, I've wondered if I have diabetes, low thyroid, iron deficiency, cancer, ms, all because of an enormous amount of fatigue. I mean, I could barely keep my eyes open. Well, on Wednesday last week I took students to Savannah; was gone W, Th, F. I had my own room in a nice, quiet (mostly) hotel. On S, S, M, T, Kevin slept in the playroom because of sleep issues with his knee immobilizer. So, I had my own nice, quiet room. Man, on Tuesday and Wednesday, I felt great, clear headed, lots of energy. Kevin got a new knee brace on Wednesday and is actually now allowed to sleep without his leg being elevated, and without his brace. So, starting on Wednesday night he and his snoring have moved back to our bed. Thursday, I was a little sleepy. Today, I'm so fatigued I wonder if I have diabetes, low thyroid, iron deficiency, cancer, or ms...........