I am a 73 year old woman. I had a partial hysterectomy when I was 27 due to uterine cancer. For the last 8 months I have been having hot flashes, night sweats, I itch all over all day. Cold during day then a what rush through my body and head. Very fatigued, lost 17 lbs. I'm not on a diet. Very high anxiety. Feel like I am coming out of my skin. I have been trying to find out what it could be. My dr has run all kinds of tests. Nothing!,, what could it be?