A.S.
I was thinking perimenopause too . . . another thing I wondered is whether you started a new B vitamin. One of the B's can make you "flush" (can't remember which one - is it niacin?). Another thought - could your thyroid be off?
I'm not a health care provider of any type - this is just my "mom" opinion. :)
ETA: Just saw your B-vitamin comment - that could very well be it (as I mentioned above).