The best thing to do in that situation is to just tell yourself that you got it in with the best of it and that is all you can do. You can't control the cards you can only get your money in when it is most profitable.

The guy got very lucky and I'm not sure what the exact odds of this happening are but it is safe to assume it is very slim. Ask yourself: "Would I have done anything differently if I could have seen his cards?" If you answer No then don't sweat it. If Yes, then figure out what you will do differently next time.

When I am on tilt but I know the situation is profitable I simply tighten up my game for awhile while I cool down(pretty much only playing pocket pairs, I'll even fold AK to a raise so I don't put myself in a postion to lose money with a reraise -> failed c-bet). You don't want to have to make any big decisions while you are in that state of mind. Once you regain your composure then get ready to go back to war.