Suggest Remedy For Fever & Throat Blisters/sores

My 2 year old has had fever on and off for 5 days. In the middle of all this, I took him to see a Dr, who said that my child has strep throat and was given 3 days antibiotics. Now, the medicine is gone and he is still with fever. During these 5 days, he had only eaten 2 yogurts,1 cup of broth and 1 small bowl of chicken soup. It seems that he only wants juice but nothing else. I have forced heim to take all that food while he screams with tears. He wakes up every 30 minutes to 1 hr throughout the sleep of the nite. While napping , he would also wakes up many times before he finally gave up or I pulled him out of the room due to the exhaustion. He has blisters and sores in his throat and mouth and has had blood on the wipes after pooping for 4 months. And he is kissing weight....anything I can do?