J.J.
Hi S.,
I have 5 children and if one of mine woke up complaining about pain, I would probably give them tylenol and wait and see how they are later. If this has gone on for 2-3 days, then I wouldn't rush them to the ER but I would take them to the family doctor. Since this is not a "well child" visit then the doctor would probably get you in the same day you call. (mine does anyway).
Good luck,
J. J.