I was recently ill and put on the medication clarithromycin, but everyday I took the medication did not make me feel any better, slowly the symptoms decreased and while I was supposed to stay on the medicine for 10 days, I only took it for 6 because I kept feeling a headache that would not go away without advil or something of that nature. I have been off the medicine for 3 weeks, but continue to have a sore throat, do I need to go into see a doctor again?