@vasqueztion But he knew of this issue before the trip, so I doubt it was any spontaneous medical episode, especially since he sent a text (sending a text during a heart attack, lol). The three pieces of foreshadowing don’t add up...
...and yes, I’m aware that it is very, very unlikely to be something dark that happened, it’s probably something like his back is hurting so he is regretful that he can’t bone his wife anymore (lol), and on the way to the beach, his back gave out and he’s now at the hospital (he didn’t tell them as to not ruin their day at the beach?). Just my guess, why not?