I have sudden body temperature rises, with no external related cause, such as a predictable anxious situation, etc. It can happen at anytime and lasts until my upper body is drenched, then it disappears, usually after I excuse myself, take off my shirt and cool myself manually, then I am fine. Heart is perfect, age 63, bp low but on 10mg meds, great physical shape...Is it thyroid, if so what would be the solutions