I have had hot flashes before so I know that is not what I am experiencing but I have recently been feeling like I have a fever whenever I get any type of movement/exercise. When sitting still I am fine but whenever I get up to do anything I break out in a sweat. Last time I checked (a few days ago) I had a low grade fever (97.5). I addition, I have had problems sleeping and am tired all the time. The feeling hot has been going on for a couple of weeks now and the problem sleeping has been for 3 nights now. I wake up after 2-3 hours of sleep and am incredibly hot and can't get back to sleep.