Welcome to HCM,
After going through your history,you had completed course of antitubercular therapy in feb 2013.
node enlargements in neck now can be due to Tuberculosis or due to other causes also so it is good idea to go for excision biopsy
once it sent for histopathology result of this test will decide future course of action.
Lymph Node TB is extra pulmonary Tuberculosis
,but you have recently completed course of TB medicines,there could be a case of development of resistance or other disease or pathology involving Lymph Nodes in neck.
You can also get complete blood count
and smear study to find out if there is any thing present.
Other possibility is many drugs may cause Lymph Node enlargement if you are taking any one the most likely you may be taking ISONIAZID?
Please get excision biopsy it will certainly help your cause.