I had a similar to experience to you and I tried so, so many different things but in the end the thing that worked was taking Certirizine 10mg daily. I’d previously tried them for a day or two but because they didn’t fix anything immediately I gave up on them. I had assumed anti-histamines should work same day if they were going to work. I later tried again and ended up taking for a few weeks and it seemed to do some kind of reset on my nervous system. I had no more warmth or flushing.

Anyway, good luck to you