Please repeat the FNAC of the lymph
The lymph gland swelling along with night sweats
probably points towards an infective pathology like Tuberculosis
. Do you have a productive cough
and loss of weight as well? If yes, go ahead with screening for Tuberculosis.
If it is other infectious causes, it can be treated accordingly with a suitable antibiotic.
You need to follow up with one doctor for this to get complete cure.
Hope this helps. Get well soon.