A few days stop, I had to go to the ER because of a very large oral abscess in my lower right jaw. I was put on Penacylin 4x daily, due to the fact that they REFUSED to drain it. Mind you it was so large that it wrapped around the bone and was traveling down my neck, and traveling up the bone towards my ear! Now after only three days on the antibiotic, my tongue is very red in spots, bleeds and is so painful that drinking water hurts. Now there is an ulcer type sore on the other side of my mouth but on the upper jaw-line. Any ideas what this could be or how to get the pain under control?