My daughter is 18 months old. She has a bad ear infection that do...

My daughter is 18 months old. She has a bad ear infection that doctor thinks that it is lingering since it has started a month ago. Omnicef was her 3rd dose of antibiotics that we tried after amoxicillin and augmentin. After her 2nd dose she started getting red in her cheeks and had loose bowels, after 4th dose she was covered with hives and rash all over her body, worst on her cheeks. After taking her to the doctors office, we were told that she has allergic reaction to omnicef. She was given benadryl (4x 1tspn per day),doctor said it might take a week for the rash to disappear and for the ear infection she was prescribed with zithromax ( 1tspn per day for 3 days). If anybody has experience with this kind of problem, I would appreciate some feedback.