Hmm, first thing that comes to my mind is a symptom of oral thrush, which can result after being on antibiotics for a given amount of time. Can you see any white patches? A more detailed description would help. Not to scare you, but that could be anything from the start of Strep throat to an orally-contracted STD :/
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Mouth Ulcers, they are pretty painful, don't drink anything fizzy, keep rinsing your mouth every now and then ( mouth-wash ).