Hi. I don't know what you have based on your symptoms, I'm not a doctor or anything, but I know of a site that lets you plug in your symptoms and it gives you a range of conditions to look at. I typed in your fatigue, rashes, breathing difficulties, and loss of menstrual cycle. It brought up Diabetes. I didn't factor in sleep problems or the glucose levels because they weren't on the list of symptoms to choose from. But maybe the elevated glucose also goes along with Diabetes. I don't want to scare you or anything because this site is a site and not a doctor. The site is called WrongDiagnosis.com. I know the name sounds horrible, as if the site will botch a diagnosis, but it is a site that tries to help people from falling victim to a wrong diagnosis.
Although, if it was Diabetes, I would think a doctor would have caught by now. On the other hand, my father-in-law wasn't diagnosed with Diabetes until he had his first insulin reaction and had a seizsure. Really, I'm not trying to be a downer or to scare you, but if Diabetes hasn't already come up with a doctor, perhaps you should bring it up. If you go to the site I mentioned, go click on symptoms and scroll down to where it says "multiple symptom search."
Hope this helps.