Persistent sore throat for months, malaise, l swollen, tender tonsil, currently amoxicillin, ketoconazole, anti-histamine but no better?

Infection: It appears more than simple sore throat.....contact your ENT/medicine doctor for full check up thru some specific tests

Culture: Have you had a culture of your throat? It appears that you may be being treated blindly. An antifungal is rarely given for a sore throat, unless there is positive culture evidence of a fungal infection. Furthermore, amoxacillin may not destroy as much as 50% of NTHI (a bacteria very commonly causing bacterial tonsillitis. In summary, unless you know the cause of the discomfort is, Rx's a guess