Lump feeling under left breast after covid?

I’m 19, female, and I got covid 3 weeks ago, cough came 2 weeks in and a few days ago I developed this “lump” feeling below my left breast, there’s no physical lump but I can feel something there internally, i get a sharp pain sometimes from that area. It doesn’t affect my breathing or anything. What could it be? I’m so paranoid, my doctor prescribed me an inhaler to help but I’m not sure what the lump feeling really is.