Hi C., I just had sinus surgery and also had terrible stomach pain for almost 2 weeks. Is your son pooping at all? Sometimes after being on anethesia, you can get all bound up and it takes some time to get regular again. Not to mention the tough antibiotics and steroids and pain killers. Poor little guy. Definitely use probiotics or yogurt with probiotics, since he'll eat that. And if you think he could be bound up, try the usual fiber foods that might help get things moving, if he will eat them (applesauce or oatmeal would be what I would try first with my own kids). I finally had to take several doses of milk of magnesia, followed by psyllium husk caplets, and finally am better (it's been 2 weeks today). You could also try tea - there are several kid-friendly teas on the market, since it looks like your son is more interested in warm foods (my son does not like popsicles or ice cream so we would have a similar problem). Good luck - I hope he gets better and will keep him in my thoughts.