I probably should not be posting this since I could be tempting fate.
Saturday night Harry started crying and crying for no reason and would not be consoled. I sent him to his room to lie down thinking he was just tired. He ended up throwing up on his bed (thankfully my husband did the cleanup since he was closest). Shortly after clearing the contents of his stomach he was back up and very chipper. No more barfing but he has become attached to Barfy the barf bowl. It will be fun trying to convince him that he does not need it any more.
My husband decided that it was food poisoning from Harry's lovely habit of eating the food off the floor that the baby has dropped. I am not convinced since crackers are not what you think of when it comes to food borne illness. We need to get a dog so I won't have to clean the floors every five seconds.