I've been without hrt for 6 weeks. The hot flashes are returning and more frequent than ever before. I'm waking often in the night, wake up then have a flush then back to sleep, and having several throughout the day. They aren't as troublesome as they were before hrt, generally plain warm feelings.
So here's the interesting part. I've had a nagging headache all afternoon today, but each time I get a flush, the headache subsides during the flush for about half an hour after. I wonder if the headache is from lower hormones and the flushes are little surges of hormones, or perhaps the other way around.
There may be some entire other mechanism involved, blood flow or something. I'm not concerned about it but found it interesting so thought to share.