Oops, you'll got a massive gap between the comment and you card.

For heart attack you could maybe do it like figuratively? You know how people say 'you've almost gave me a heart attack.' Followed by copious amounts of petting and sorry's. I dunno where my mind was going with that.

Major injury could be something like a horse ridding accident.

Clearly I can only think of ideas for other people, lol.