I know its the hardest thing to do but you must not fear your symptoms. The fear will make them worse and bring on even more symptoms. If youve had your health check ups done (blood test, chest xray, blood pressure, ECGs and other heart tests) and results are good then the symptoms you feel are brought on by your constant worrying and feeling on edge.
You must rewire your brain back to normal. Your nervous system is on overdrive.
I have had the heavy anxiety for 6 years where I've felt like im having a heart attack countless number of times and nothing has ever happened. Ive never fainted or anything. Been to the ER loads though from panic attacks.

Go see your doc and let them check you. It'll set your mind at ease.

We are all here for you : )