After taking my 2 yr. old son to the emergency room 3 days ago wi...

After taking my 2 yr. old son to the emergency room 3 days ago with a high fever, was given Augmentin. They determined he had a red throat and shoved this awful medicine down his throat. They said it was a precaution incase he had an infection, so it wouldn't get worse. I have no choice but to continue to give it to him now. He is normally an easy going kid. Since I have been giving Augmentin to him he has been very cranky, and miserable. He has diareah and is now developing a red rash. It's barely noticeable but it's spreading all over his body and it's a little darker than it was yesterday. His appetite is not as good as it was either. Oh, one of its ingredients is aspertame. This sweetner has been known to cause grand mal seizures and migraines. What is this doing in a childs medicine? In any medicine for that matter? Is there an alternative to this medicine out there?