Hello.
From the test result you are infected with TB baccili.
Infection and disease are two different thing.
a positive Mantoux test shows you are infected but cant say you have active TB disease or not.
As you have enlarged LN and occasional cough , you may have active extra pulmonary TB.
a good lab tech should have been able to take a good sample from FNAC and that too under US guidence.
Next Steps
I suggest following, please.
1.Get Chest X ray done. PA view.if not done already.
2. if sputum can be produced by you, especially early morning - than ask sputum test by Genexpert. Its most reliable sputum test available in most major cities.
3. Get FNAC done from a good lab in your city. The cytological exam will show TB or otherwise.
I would advise no excision of LN at this moment, as if its enlarged by TB it can regress by medications if not big or discharging pus ( cold abscess) .
you can please chat online too for more details.
TB is curable and its better to have good info about the disease for proper treatment and cure.
Free of cost trt available at Govt DOT centers.