Hot Flashes

Something doesn't seem right about hot flashes.  The other day I was having coffee with a co-worker and it triggered crazy sweating.  Sweat was literally pouring down my neck.  Now if you sweat alot, shouldn't that be getting rid of fat in your body?  Doesn't sweating expel calories?  HHHmmmm, that doesn't seem to happen.  This makes no sense.