I’m 26, fat (weigh 240lbs, 6’2”, male), and have no heart problems that I know of. Can I have a heart attack if I run as fast as I can...?

... for as long as my body physically lets me, in attempt to push my physical and mental limits and to speed up my weight loss journey? I did such a thing today a few times in a row, and my lungs felt like they were on fire, my heart felt like it was going a million miles a minute, my legs felt like rubber, and I felt like I was going to pass out. I’m using dramatic words but to some extent that was literally what it felt like. My watch claims my heart rate was at 182bpm. For someone who clearly doesn’t work out, I therefore have no idea if that is too high for a couch potato’s heart to run at. I don’t think my symptoms were anomalies for an out-of-shape person by any means. I just want to know if I can keep pushing my ultimate limits at such an early stage in the process of getting back into shape (use to be an athlete believe it or not).