Can a swollen tonsil cause gagging?

Hello doctor,

I possibly had mono five months ago. I did not get it confirmed with a test though. I felt better in two months. However, I was stressed a few weeks ago as I got a lump going from my uvula to my tonsil on one side of my mouth. I initially thought it was an allergy and left it. Two weeks went by and it did not go away. I went to my doctor and she said that she did not see anything. Although I felt she did not try hard enough and when I had stuck my tongue out she could not see it as well. So, it was a waste of money. Now, my tonsil on the other side is swollen. I was gagging a lot as my sister thought it was funny and kept grossing me out. But now, my throat hurts. The lump is obnoxious and I have been having mild sore throats since the time I first noticed it. It cannot be an allergy because I do not eat the same things each day, nor do I stay in the usual environments that trigger my regular allergies. I am worried.