Suggest Remedy For Pain In Throat And Middle Of Back

I have had a strep throat and the doctor thought it was healed. I had a sever sinus infection and it was healing. So Ithought. I went back to the doctor's on Friday and they gave me Levaquin 750mg. I have gone to the doctor three times this month. I have only taken two pills.
My throat is very painful and the middle of my back hurts.