Strees and anxiety probleme is this normal?

I have a anxiety since i stop smoking and its getting worst one pain and i feel its more i go to gym daily, one time my frmd nurse call me for a free ecg test den i go to their clinic to have a test she test me once then its written der incomplete right bond block or smothing den i said ill take rest den try it again den for a couple of minute she try den its the same gain i go to my work to inform my manager that i wang to go home bcoz i have some problem then he sent me i go to our company clinic to have a second opinion the doctor said dont believe wats written der bcoz the important is the reading of the graph den usaid can u ecg me again then he do it to me its saying normal sinus rythm den im not feeling goid i go for a third opinion den dey ddn make an ecg to me but they said the reading is normal but im stil afraid beacuse i feel little pain in my left chest like a cold pain goin to my left back thats why im afraid did somebody explain this to me is this normal or not beacuse of the anxiety or stress