One of the biggest challenges with these types of symptoms are that they can be from a number of things that range from serious health risks to psychological symptoms of anxiety
. The problem with the anxiety attack symptoms is that they make you more anxious, then the symptoms get worse - it's a cycle.
Did the family doctor do an EKG where they put the sensors on your chest and measure the electrical impulses from the heart muscle? or did he/she just listen through the stethoscope? Do you have a history of anxiety or depressions? Are you going through (or recently went through) something very difficult or emotional?
At 17 do you have a driver's license? The local hospital should have a free clinic if you really feel that concerned. If they tell you that it might be some sort of cardiovascular illness, then ask for a written report to show your parents so they'll take you to a specialist. If they tell you it's anxiety, then ask if they can refer you to a mental health services clinic. Your parents' insurance probably has a mental health policy, but I'm not sure that they'll help you, based on your question, so that's why I suggested the clinic. I was also thinking of suggesting a Family Planning/Planned Parenthood Clinic - and I see someone else already did. It may be a better option as a starting point than a hospital clinic because their rules are a bit different at your age and they are people who care for just young women like yourself and have a lot of resources to recommend.
Whatever the cause - worrying and stressing about the problem does make it worse, so try to do some deep breathing, relaxation and meditation
exercises - maybe some yoga
. This way, when the symptoms act up, you can help your body overcome them by triggering the relaxation response, which is a proven medical phenomenon.
Other common sense health and wellness tips also apply - get plenty of sleep; drink plenty of water; minimize or eliminate caffeine; minimize or eliminate sugary/processed foods. Get some low impact exercise, like yoga, pilates, or even walking at an moderate pace.