You absolutely need to see a cardiologist specialist for a full work up on your heart. There has to be some underlying condition that was aggravated when you took the AAS or a complete coincidence once you started eating like crazy and working out extra hard put stress on your heart that it couldn’t handle. Though 3 weeks is IMO quite fast for something to take effect. I have know 30 some year olds in perfect health, exercise regular have a heart attack out of nowhere due to basic genetics.
I think you should forget AAS and just try to keep a healthly lifestyle and be sure whatever you do your heart can handle it based on the specialists recommendations. Life is too short.