I am a 20 year old female and overall, I am very healthy. I have recently developed some problems related to the heart/chest area. Randomly, my heart will start beating very fast accompanied by chest pain, trouble breathing, dizziness and after all these symptoms are over with, I always get an awful pressure-like headache. Today, I noticed pain on the left side of my head, sort of behind my ear, and also a little shoulder pain. I do have sports induced asthma but have not used an inhaler for over a year. I have taken birth control since I was 15 and my doctor switched me a year ago to a new pill. I thought maybe it was the birth control because at first I also had tender breasts. However, I have stopped taking it for about two weeks now and the only change is that my breasts don't hurt anymore. All of my symptoms started about a month ago. Am I overreacting or could something be wrong?