Thanks for posting your query.
With the available described results of investigations and symptoms, there appears to be possibility of tubercular lymphadenopathy
Presence of enlarged lymph nodes along with positive TB gold, FNAC and montoux test suggest the diagnosis.
You have to take antitubercular treatment (ATT) for coming 6 months. Now treatment duration has been revised from 9 months to 6 months and further duration depends on the response of patients.
As per mentioned treatment, you have been advised right treatment.
If lymph nodes are already fibrosed then reduction in size is not possible otherwise complete resolution will occur.
Dr. Mayank Bhargava