You should call your doctor and ask if you should stop taking it until you can get in to discuss. It is an odd reaction to amoxicillin. Your sinus infection may not be completely gone, your doctor might want to put you on something else. If you can't reach your doctor or his/her nurse by phone by tomorrow morning, I would go to an urgent care before taking any more of the medication. FYI, I am an RN.
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