Yep the increase in heart rate is normal during a hot flush/sweat. Mine start with a horrible feeling of doom followed by a slightly sick/ upset bowel feeling and then the heart rate rises to around 120 with me. The sweat follows and then I eventually go back to normal. The whole thing takes around five minutes and then, fifteen minutes later, it starts again. Am fed up with them but hope GP will restart me on HRT fairly soon. I've tried for a year without HRT but it's just not working!
Taz x