Hello. I am 24/m and I have a duffle bag full of anxiety. Ive always been a hypochondriac since I was a young kid. 
A few years ago I was on a cruise and I drank to much and ended up in the medical center on the boat because I was hella dehydrated and having a panic attack. They ran an ECG on me and told me my heart has something wrong with it. Sent me off the boat to a hospital in Cozumel, mexico. A cardiologist ran an ultra sound on my heart and took a bunch of measurements and told me I have an enlarged left ventricle. But that my heart was healthy and that hearts are all different and Im fine. I didn't worry about my heart after that and I never had before that either. I ran track in highschool, weightlifted, and have always been very active. (Google pretty much told me I have something called athletes heart, left ventricle enlargement is normal if you're active)
Fast forward to last year. My wife got pregnant and about a couple months after that I had a really bad migraine when I had covid. My life has honestly just been a spiral of anxiety ever since. I started thinking back about my heart and wondering if that cardiologist was right or not. I get left arm pain often, on and off, but I'm a roofer. I work hard as shit all day and it's a lot of cardio. My resting heart rate is low typically around 50-55. The arm pain scares me tho. And I drink alcohol very often and smoke as well. I also play tennis every weekend. 
Anyway sorry I know this is all jumbled I'm just pacing right now and feel stupid anxious. I feel like if I had a bad heart I would probably have died on a roof already. And I don't get chest pains, but I do get acid reflux here and there and it's always accompanied by my left shoulder throbbing (which also happens without acid reflux)
I don't have insurance. Do you guys think I should spend the money to go get my heart checked again? Or does it sound like I'm just being ridiculous? Any feedback would be very appreciated. Thank you