My son is 20moths and was dignosed with strep throat 5 days ago there was some improvements there for 2 days over the weekend now it's like I'm going through hell again his fevers are unbelievably high and in what seems excruciating pain. He also has sores in and around his mouth I'm very very scared for him I'm worried it's something more or worse then strep throat? What am I going to do I need help desperately can anyone help plz?