First, I need to say I'm thin, have low blood pressure, and am 47 (close to menopause possibly). My hands and feet are cold most of the time and I only swim when the ocean is above 80 degrees (the salt water is wonderful for FM). I like pools in the 90s range. When I use my heating pad I get palpitations and overheated and I really can't understand that because I'm cold so much and can't tolerate cold weather. Hot weather doesn't bother me, just putting the heating pad on my neck, back, or near my chest. I have a very "sensitive" heart and am thinking this might be the reason. I've taken my blood pressure to see if the heat is dropping it dramatically but usually not. This has become hard because the heating pad helps my neck and shoulders. Anyone have the same problem.