You have been diagnosed as suffering from Tubercular Lymphadenitis
, Characteristic is a round swelling in the neck on side or posteriorly, typically more than 2cm in size, firm to feel.
If the swellings are multiple and rubbery likely diagnosis is Lymphoma-in which case they are painless.
If excruciating pain present then it'spyogenic origin due to infection around local region.
The gold standard for diagnosis of Tubercular Lymphadenitis and Lymphoma is Excisional biopsy
of the the lymph node and is standard pre-requisite if Antitubercular treatment is to be started.
Please ensure that you are biopsied unless your physician is damn sure about contacts history.