dental abscess
"I'm currently taking both of these antibiotics for an abscess, my toothache went  within a day and my swelling has calmed down slightly but it's become a lot easier to talk and smile again due to the pain disappearing (I physically couldn't smile to a certain degree, hurt too much too) 
Side effects - I have experienced drowsiness, dizziness and I have been feeling light headed but it also really hurts when I move my head, e.g. bending down, moving my head side to side etc. feels like all the blood is rushing to the side I move to? Painful anyway"