Sick baby

I have a sick little guy today. His hasn't been eating the last two day and has complained his tummy hurt. We thought it hurt because he was hungry...he sure hasn't slowed down any. Well, last night he was up and down and today has a fever. He has laid around all day, and every now and then has little bursts of energy but crashes on the floor complaining EVERYTHING hurts. He has cried with his tummy, legs and feet ALL day. Kinda has me worried. I called the dr. and she said unless his fever gets up higher or has it for more than a day they really won't be able to do anything. Don't want to give him antibiotics for something that may pass in a day. So I am giving him tylenol and he's been asleep since 1:00. That's so far a 3hr nap for a kid that barely naps 1hr. Hopefully he will feel better when he wakes up?!