Thanks for choosing health care magic for posting your query.
A lot can be answered in a better way ifI was knowing your age. But the kind of problems that you have described doesn't appear to be physical in nature. It more so ever appears to be psychological.
You should get an ECG done and get a consultation from a cardiologist. If he says it is fine, which mostly is what he will say, then you should visit a psychiatrist
who can train you with some relaxation techniques
and also help you with CBT. He may use some drugs initially to make you feel better.
All said it is not something big you need to worry about.
Hope I have answered your query. I will be more than happy to help you if you need any further clarifications.
In case if you want to discuss with me directly you can use the link:
Wish you a good health!