Please do not stop any medicines unless you asked to do so by your physician. As this will lead to many adverse reactions. In your case-Sudden stoppage of Carbimazole
will lead to excess release of thyroid
For lip sores please use B-complex capsules for few day and use some local soothing agents like- Zytee gel.
For sore throat-start doing warm salt water gargling three-four times a day and paracetamol
tablet as and when required. This will also address your ear ache