In what way did it affect you precisely? Might be an idea to stay off the alcohol until you see how the Carbimazole affects you. It can cause problems in some people, itchiness, low WBC, liver problems.
2.5mg is a very low dose, if you still get problems your GP could change the medication to PTU.
It appears that nausea and headaches are a side effect of Carbimazol (I didnt suffer anything acute from taking it). If it carries on I suggest you go back to your GP, dont let him fob you off. I presume you have another appointment anyway with the Endo?
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