My Husband Had Ear Surgery Which Was Removing Ear Because

my husband had ear surgery which was removing ear because of cancer. was given augmentin generic amox=clav 125mg starting 20th of march. Did very well with surgery, however now his throat and jaw hurt so bad cannot get food soft , jello, pudding ensure any thing down him. Taking tynol 3 and asking for more because of pain. could this be a allergic reaction to medicine. This is his worst day.