Could he have an ear infection?

Hubby and I have been talking about the change in Blake's attitude and I mentioned that the last time he went through a phase like this, he had a sinus infection. He is the type of kid that will never say die. If there is playing to be done of any kind he would never admit that he was tired or not feeling well. Fever is really the only thing that will slow him down. I wouldn't be surprised if he has a ear or sinus infection and hasn't made a peep about not feeling well. I guess I'll give it another day or two and see if things improve and if not, I think I'll take him and have the doctor take a look. Even if I am just crazy, it will only cost me a little time and a $10 copay.