I am Dr Mbong. First thanks for the elaborate description of your health.
causes are multiple.
Eleptriptan as the physician told you in December can provoke heart attack-like symptoms due to the fact that it reduces migraines by causing blood vessels (ideally of the brain and as a side effect, blood vessels of other places including the heart) to narrow.
Narrowing of the coronary arteries (those that take blood to the heart) can be caused by other reasons other than medication: exertion, emotions, high blood lipids
I advise you rest as much as you can and avoid emotive situations and see if the chest pain
comes again or more often or worsen. If they do then see your physician and report including all the medication you are taking.
There are anti-migraine drugs which have less contrictive effects (like Lasmiditan) and a such may have less side effects on blood vessels else where including the heart. They may be others which act otherwise and may not act on blood vessels. So please ask your physician to prescribe such an alternative anti-migraine drug if you need it.
Get well wishes,