question: Hi. I m a 19 yr old female. For about 3 or 4 years I ve been having this problem. First I feel like all my blood rushes to my head &I get light headed &feel butterflies . Then my heart starts beating fast. I don t just mean fast as in just ran a half mile but probably double that. Like 5 or 6 beats per second. You can see my chest beating. I ve had other people feel it as well. It also gives me very sharp pains in my chest. It hurts to breathe or swallow. It feels like there is a truck tire sitting on my chest. Then it just stops. Not gradually. Just instantly stops. This happens very randomly. I could be working or lying down or folding laundry. I ve been to the hospital multiple times&they ve never found anything wrong. I need to know what s wrong.