on Dec. 30,2010 I took my 7yr old son to our family doctor. He was congested and having pain in the front of his head. My doctor thought it was a sinus infection and put him on cefdinir he was having terrible stomach pains so the doctor switched him to azithromycin for the remainder of his perscription. He now complaines of headaches, stomachaches, back pain thoughout the day on and off. Went back to doctor he thinks it's not sinus because of the two antibiotics. He asked me to give him Zyrtec (allergy med.) for two weeks to see if he has allergies. Coby has never been a sick child besides common colds and coughs, etc once in a while. In Oct. 2010 he was hosptialized with pneumonia for 3nights. I am concerned that maybe something is going on from the different medication from them and now, harming his organs? no good bacteria let? These pains sometimes have him teary eyed. He is not a complainer either, that what worries me. What should we be checking? thanks