Heart problem or any else. No sweating!

Read full and help.. In my work from scenario, initially i started fear about corona virus.. and then it converted into heart attack fear. Oneday suddenly my heart beating very fast with mild dizziness (During that time I am in conscious and i can walk and talk) After the incident i rushed to hospital and took ecg, it is normal. Still that i took 6 ecg, 2 echo, 2 tmt, 2 chest xray, thyroid, sugar level and blood test, all test were time and again came normal.. still i living with heart attack fear and anytime something gonna happen to me. Now i feel fear to walk, eatt nonveg, do exercise, traveling, staying alone, Even if mild symptoms happened in my body i started fear and nervous it's heart related problem. Even the report normal and doctor said my heart is normal i can't believe them and living with fear. Past 2 years i experience this hell, i can't live happily and can't enjoy anything. Always this thought running in my mind. but i never feel pain chest, no breath prob, no sweating