I had strep throat about 2 or 3 weeks ago and it went away. Now all the sudden my throat has been hurting when I swallow or yawn. It has been going on for a week and some days it just goes away or I don't feel it and then it comes back. I don't think I would have strep again because I know I don't feel sick at all and there aren't any white bumps. What could it be?