It seems from the history that you are probably having tonsillitis
or inflammation of tonsils. It needs to be treated by antibiotic drugs and analgesic
drugs. You are currently on zyretc which is a anti allergic drug and it is effective only against allergic conditions. The drowsiness
is because of side effect of zyretc.
Hence I advice you to consult your doctor preferably ENT doctor for evaluation and treatment accordingly.