I have been experiencing heart palpitation after walking a short distance, drinking herbal teas that are caffeine free and moving around my apartment. And sometimes after drinking water that I have boiled. My heart beats fast anytime of the day especially when i arrive home. My blood pressure will sometimes be normal and the pulse is 99 to 100 and sometimes visa versa. I'm on one blood pressure medication and HCGT once a day. It can be a little scary because it will last for 15minutes. My doctors are aware of it. Is a blood pressure of 99/78 normal. And when is the top number and lower number is too high?