Oh Lord...........My heart goes out to you......... Yes, it does seem to happen in "3's" doesn't it.
I haven't read other people's posts, but I'm just going to plow in and assure you that your little one will probably be okay because he's so close to weaning age. But, yes, it wouldn't hurt to add some milk pellets in his grain for a little while..... at least until his normal weaning time.
If there are other youngsters he can be with, that will help. Most of what you'll be dealing with in regard to him is the psychological loss, not the nutritional.
I know saying "I'm sorry" doesn't cut it right now..........We've been there more than once........and there are still those teary moments. I think we are allowed them and should honor them.