My 9 Month Old Son Has Recently Been To The

My 9 month old son has recently been to the after hrs We 3times in a week for fever and vomiting....he originally had an ear infection. They proscribed amoxalcillon...turns out after day 6 of being on it he's allergic to it. I sent photos to his regular pediatrician they then proscribed azithromycin. He continued to run a fever it never really broke even with taking Tylenol and Advil.to top it he has been vomiting. The ER Dr says he's not dehydrated. And may have a cold he dies have mucus that's draining which he coughs so hard he vomited multiple times...we don't use a humidifier because it makes it worse and he gets the chills...which in turn increasing the fever not sure what to show has had a fever 100+ for 6 day now....and Dr says ccb it's just my a cold yet I know a fever for a certain amount of time can cause damage to organs