I was diagnosed with strep throat on Wednesday and was given Z-pack(allergic to penicillin ).Next day had full sinuses ,ear pressure ,cough ,stuffed head and lots of green phlegm. Took last antibiotic pill today .Throat fills better ,but yesterday I experienced severe pain behind my front teeth ,roof of mouth is swollen,extremely painful ..hurts to eat or speak ,and I have a 99.7 temperature. Do I need a different antibiotic ? Is this a sinus infection or something related to the strep ?