Wow! Same with me. Had a heart attack driving between Naples, FL and Cincinnati, OH. 2012. Just me and a couple cats.
I turned around and drove back to Naples and slept it off. Then drove the next day to Cincinnati.
Wife made me an appointment to see a doctor who said 95% blockage.
Got a stent the next day. Doctors said I was extremely lucky it didn’t kill me. I had an unusually tight bend in the LAD that got filled with plaque.
I think what saved me was that I kept hitting myself in the chest after I stopped the car due to the pain. Hitting myself felt better than the heart attack.
Damn, son! No ER’s between Naples and Cincy off I-75???