your best bet is to go with how you feel if you are having pain even though your test results are normal something needs to be done.
recently I sat in a room full of people who were all having either a treadmill or dipyridamole myocardial perfusion study stress test ...yes that is a long name for an injection to stress your heart rather than having you run on a treadmill , with nuclear imaging pictures taken after 45 miutes from either method of stress test . I was there from 6:30 am until 2:00 pm waiting my turn , so there was no shortage of interesting personal experiences and conversation .
Several of them were sent there by concerned spouses several were there as a cautionary and on going repetitive measure , several had to demand something be done to treat their heart problem because unless you are truly suffering or have at least an 80% blockage or are actually having a heart attack they usually do nothing and myself well I'm under fifty had 2 normal ECGs and 1 xray BEFORE my heart attack .
ECGs are extremely unreliable . I find where your heart is involved there is no better treatment than a second opinion I know an ECG can tell you if you are having a heart attack but likely won't tell you anything else .