I had to completely go caffeine free during peri-menopause. Now I drink half-caf and that seems to work. However, perimenopause completely blew out my thermostat. I can be freezing one minute & overheating the next. Truth be told, these days - I'm more cold than hot. But it's still uncomfortable.

I couldn't do any kind of HRT due to other health issues, so I toughed it out. I ate as much soy as I could hold & after about a decade it settled down. You might want to try an ice pack on the back of your neck.