I've been dealing with a higher heart rate for about 45 days now, and it's really starting to make me feel nervous and cause chest pain. This actually happened to me about two years ago as well, and back then I did all the tests like ECG and 2D ECHO but they didn't find anything wrong. Now that it's happening again, I'm really concerned. Can you suggest what might be causing this or how I should treat it?

It sounds like you may be experiencing symptoms of anxiety or panic attacks. To help manage your symptoms, you can try taking a beta-blocker medication such as Propranolol. The usual dosage for Propranolol in such cases is 10-40mg, taken 2-3 times a day as needed to control heart rate and chest pain. However, it is important to consult with your healthcare provider before starting any new medication.