He's coming back home tomorrow though, which doesn't mean anything. If he was ok, then mum would've said that he was (in fact she said that there was something wrong but wanted to explain it to me).
So now my mind is thinking over all the things that could be wrong. Sure, him coming home means that it's not 'he has x amount of days to live' but it's doesn't rule out 'x amount of months' instead.
Maybe I'm just being paranoid/pessimistic.