It started with a terrible toothache, once I went to the dentist they noticed on the x-rays I had a severe infection in my front tooth and it had gotten to around my upper jaw. I had the root canal done and after I was prescribed the z-pack antibiotic, I'm allergic to penicillin so I had to take zpack. For the past 3 days I have been incredibly sore, and I have been taking a lot of pain pills and the zpack. My concern is that my abscess feels like it's getting bigger, and I had not even noticed the abscess prior to the root canal. I will be going back to the dentist Thursday.