I had severe hot flashes for the first year on Lupron. As a hot flash was hitting I would feel a lot of fatigue. After a year, my oncologist prescribed a depo-provera shot every three months and it really stopped those hot flashes on Lupron. There are other hormones that can do this, speak to your doctor.
I know one person that says eating tofu every day really controlled his hot flashes, another person in this forum said the same thing. Can’t hurt to try it. Black Cohash is also said to help. Acupuncture works for some people.

I have an embrlabs.com wave product (wave 2). I’ve used it for Over three years now. It’s like a refrigerator that looks like a watch and sits on the inside of your wrist. You could set up one of the buttons for their night mode . Hit the button twice and It Produces cold waves at measured times during the night and prevents hot flashes and night sweats. They used to bug me, before I got this device . When you start to feel a hot flash coming on, you hit another one of the buttons twice and it sends cold chills through your arms and it reduces the intensity, shortens the life and can stop the hot flashes if hit quickly enough.
https://embrlabs.com/

A desk fan is a very good investment. Whenever you feel a hot flush starting, just sit down in front of it for a few minutes, and you'll feel much better.