Yes, I know and I've told him that I don't want to see him in hospital before he stops pushing himself so hard. (I'm so sorry about your husband Honeyb). The consultant said the Y chromosome (woman consultant) is impossible. Men neglect their health until something bad happens, as you say.
I nag endlessly. I've talked to him about it so often.
When he did def have C Diff, he worked while he was on metronidazole, feeling awful, snow white tongue, AND it was last summer when the weather outside was stunning.
He was lazy as hell when I met him (student!) but is a workaholic now with a lot of stress about no-one else being available to do the work - some of which is entirely justified I think as there aren't many people he can delegate to. And when he has something that has to be done, he can't switch off until it is done and done properly.
So I'll keep on nagging, and worrying. I hate nagging.
He laughed when I told him no-one on their deathbed ever said "I wish I'd worked harder" !
He took his current job as thought it had a better life/work balance and it did for a short while, then they made big changes, gave him more responsibility (which he enjoys) but also there's a high turnover of younger staff who need supervising and he often has to redo what they've done as well as his own work.
Sorry to rant on. x