Having unexplained symptoms help needed.

For first time in lastJuly I suddenly felt a thumping in my chest, I saw my Pulse rate was 150.I went to ER and ECG said T have sinus tachycardia and HTN and ER Dr sent me home saying I am stressed,but after that I felt a piercing chest pain often at the left side of chest,trop t is -tive (24 hr later). I had my family physician checked me and found I have hypertension. he prescribed HTN pills,which I took over this year I had 5 ECGs done (whenever i had chest pain and felt dizzy, i do a ecg ) all reports came normal, my Ech(2d) report was normal, my ldl is 113 mg/dl , my hdl is 49 mg/l, my triglyceride is 106 mg /dl, my TSH and FT4 are in normal range, my CBC is also normal, my HBA1c and Estimated Average glucose is also normal .I have consulted 2 cardiologist and 3 MD general says I am fine but still l have these symptoms (seldom stabbing pain at left side ,heart palpitation, feels dizzy and sometimes have trouble breathin. i don't even know what is my problem  HELP