Throat Infection

So about two weeks ago i had a severe sore throat. i hada fever the chills and i was weak. My doctor tested me for strep throat but it came back negative. My Dr thought it had just not developed enough yet. The back of my throat had white spots on it.So he put me on a antibiotic. I took it for ten days like i was suppose to and it went away for about 5 days. Now its back. I went to the doctor and they tested me for strep again and mono. They both came back negative. Any ideas what this could be?
lacyshaw lacyshaw
Jan 7, 2013