What Are Profuse Sweating, Nausea, Dizziness And Extreme Thirst Suggestive Of?

I awakened in the night with profuse sweating, nausea, the need to use the bathroom and dizziness. I thought I had heartburn initially, and chewed two tums, but it. Got worse. This lasted about ten minutes, and I was exhausted when it passed. I was able to go back to bed then. I awakened this am fine,but very thirsty of course! This happened one other time about three or four years ago, but not since. I do not usually have any hot flashes at night, and have had. Total hysterectomy six years ago. I do have hot flashes during the day, but not like this. I had a total physical two months ago, and all was fine. I am overweight, but BP, cholestertrol, etc. are all very good.