Well they can't say that, rickman - sometimes it is OK and sometimes it isn't - it doesn't mean that he won't be fine.
Agree with everybody else, don't be hard on yourself, most of us would have reacted the same way you did.
As he is only just 3 a cuddly toy probably would be good (kids tend to regress when they're ill as you will know) but what about a DVD or video? Do you know what he likes and if they have access to a player?