Cardio anxious help. Working properly?

Hello Doctors, Pls Pls help.. I always feel I have a heart attack. I am 35 yrs old 45 kgs unmarried female with no history of diabetes or thyroid or kidney function abnormality. Non smoker and a non drinker. No cholesterol. I always get left side chest pain, sometimes back and both jaws and both legs. I am scared. My ECG and echo is always normal. I get left side chest pain. When I do exercise it goes away and sometimes it doesn't. Also I don't have any BP related issue. My BP is 120/70.. Always.. X-ray is fine and so is TMT. Once my heart beat was 116. Rest 80.. I will die I think. I love alone. Pls help. Also I feel breathlessness with left side chest pain. Are my valves working properly ??? My x-ray of lungs is normal. I have stopped going to my work coz of this. I feel scared that I will die at my workplace. No one to take care of me. HB is 12.  Pls help me dear Doctors. Regards