My 5 yr old had an ear infection about 15 days ago. He was given keflex at first. The beginning of this week we took him back to the dr s and his ear infection was worse and now put on amox 400mg susp. He has been stating that his stomach is upset, head hurts in the forehead area, and has dark circles under his eyes. Is this normal with sinus issues? My pediatricion stated there is nothing to worry about and to cont to take the medication. We are just concerned.