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highly concerning side effects suddenly began 11/22/18, after 2 weeks of methimazole (pill) for hyperthyroidism - lethargy, vomiting, face itching, irritability, hiding all day, less frequent bowel movements, bouts of anxiety. He has NOT refused food or water. vet doesn't open for 24 hours, uncertain about the urgency of the situation -- can this wait 24 hours? How normal are these side effects? Are there other side effects I should look for, that warrant immediate emergency care?

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