You need to come on my Surviving Hormone Therapy training session or presentation.
There are several coping strategies, which work well enough for many people.
There are complimentary therapies (some mentioned above), sage tablets, or evening primrose oil, or a specific NADA acupuncture protocol which many hospital cancer centres can provide (but not during COVID), usually for free for a couple of times. These usually lessen the effect, rather than eliminate it.
There are also some prescription drugs, medroxyprogesterone, cyproterone, and megestrol. They need careful monitoring by your GP, because they can all be liver toxic. Also, these drugs seem to take it in turn to go unavailable, so you may need to keep switching, which is annoying when you find something that works. Generally, because of potentially serious side effects, you should try the other remidies before trying these drugs, and only use the drugs if the hot flushes are a really serious quality of life issue for you.