As eNT surgeon I can help you in this most common cause of changing test maybe the medication you are taking and other most common cause which can be related to both of these symptoms is the chronic sinusitis which result in the obstruction of sinuses resulting to blockage of air circulation in the sinuses in the olfactory area of nose since on fiction is responsible for taste sensation also to some extent then the most common cause in your case should be a sinus infection which can be treated easily.
Since u had a episode of tonsillitis which may be result of repeated infection from sinus
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