The wave of heat can't be a normal hot flash. I had a hysterectomy at age 33. I'm 64. I turn my heat down to at least 63 or 64 at night. It's cool in my room. Every morning as soon as I open my eyes the heat starts. Seems like it starts from my core. It only lasts maybe a minute. I have to throw off the covers and stick my leg out. Sometimes I can almost break a sweat during the heat wave. After it stops I get really cold and have to cover back up. It does not happen any other time. It's weird. It's been going on for over a month.