You report everything you are required to report. Yes, the “weird heart palpitations” will trigger a red flag. Bring along copies of the cardiologists report. Same for the CT.

98% of people who present with a condition that causes an initial deferral are eventually cleared. 100% of people who hide the fact they saw a healthcare practitioner for a medical condition on their MedExpress history are breaking the law. Do not imperil your future in aviation by breaking the law - especially with the FAA.