Hello~First off, I would definitely see another doctor. Second, many women, including me, who are way past menopause, can still have those hot flashes. If possible, I would try some "Bio-Identical" Progesterone cream, this helps a lot of ladies with hot flashes and there are no side-effects from it.
I don't have any answer, but that happens to my partner as well - she is 62 and many times the bed has been saturated from her sweating and her doctor doesn't have any idea either - it is weird, I have asked about this before in another forum, but no one had any idea (and therefore no responses) I'll send a private message