Welcome to HCM
We understand your concerns
I went through your description of the problem and am pretty sure that there is no problem. Undergoing sexual intercourse after physical work or mental fatigue
should create some minute breathless feeling during intercourse. Just go back to that day and try to remember what you did on that day of intercourse. You must have been tired during intercourse.
Slight breathlessness during sexual intercourse and associated tiredness
must have caused anxiety
and the anxiety created further panic situation. I think this was the cause.
Any way to confirm you should consult a doctor and get your vital signs
checked like BP, cholesterol
Hope I could answer your question satisfactorily. Am available for further assistance.