Welcome to Health Care Magic
Gender or age is no insurance against heart attack
or type of symptom.
Heart pain is not likely to be alternating as you say...
It is probably from anxiety?
Heart attack is suggested by history and physical examination.
It is confirmed by ECG (in some, it may need to be repeated after a few hours) and Cardiac markers (Blood test
Other tests like Treadmill exercise EKG / isotope studies / angiography
and so on – are done in selected cases, depending on the need.
Your symptoms are not suggestive.
However, when in doubt, it is wiser to see and be re-assured – than wait and guess...
Wishing speedy recovery