As a PP said, roll with it. Don’t try to mentally fight the flush, just let it flow over you. Flushes can be so overwhelming, and feel like they last forever. In reality they rarely last more than 3-4 minutes. Remember that. When you get a flush you can remind yourself that it will soon be over.
Dress in layers (I now understand why cardigans are so popular among women at a certain point!), natural fibres, open windows etc. I always have a collapsible fan in my pocket to help me through a flush.
If you don’t exercise much, increasing exercise can help. Even just being more mobile.
I have heard of low-dose Prozac being prescribed for flushes. My friend found it very effective, until more menopause symptoms appeared. But if you’re past the other stuff, and this is the only symptom bothering you?
HRT really is the best thing for menopause symptoms. Why don’t you want to take it? It helps with aspects of menopause that you may not even notice happening in your body, such as weakening bones, vaginal atrophy, and irritable bladder, until they get bad enough to affect your life, by which time they are no longer fully reversible.