Ear infection/ abscess on leg


My daughter is 1 and on Wednesday we noticed a red bump on her leg and we thought it was a big bite. Yesterday she had a fever and the bump got bigger so we took her to the ER and the doctor said her left ear looks suspicious like an ear infection and the thing on her leg is an abscess possibly from the shots she got 11 days ago. Today it is bigger and her fever is 103.9. Does anyone have any recommendations on how to keep her fever down? She’s sluggish and doesn’t want to drink anything and she’s not allowed to eat for another hour because she threw everything up earlier. She had a doctors appointment with her pediatrician on Monday morning. So just looking for any tips and help from you mamas out there.