Hi! I'm mid 30s, female, 170 cm tall, thin build, 50 kg. I'm healthy,hardly ever even have a cold or flue. My heart beat started to raise many times a day recently after I got frightened of a man that started to "stalk" me from a distance. The situation is dealt with and I don't think about it any more. But still the hear beat raises as soon as I get slightly stressed, worried or even talk about stressful situations. Any suggestions on what to do?