What Causes Redness And Pain In Left Tonsil?

Hi a little over a month ago I noticed my left tonsil was a little red and hurt at the top of it right by the part that is closest to the inside of my cheek. A doctor prescribed me some clindamycin and it went away for about four weeks and then I felt the same type of pain in the same location. The next doctor has me on amoxicillin and prednisone. It has gotten rid of most of the pain, in fact, I ve only been on amoxicillin a couple of days and I would say it only feels uncomfortable and only when I swallow sometimes or when I put my finger in my mouth and push down on the tonsil, (I know I should probably stop doing that.) I should also say I have large tonsils naturally, and am not experiencing any other symptoms at the moment. I did have an earache for a couple of days. Also, I have had sinus issues most of my life, got a lot of strep as a kid, and currently am on over the counter medication for acid reflux. Just wondering what my next step should be.