do not lead to life long immunity. you may have the disease again after being declared cure which can be re-activation of dormant bacilli or re-infection from community.
TB usually heals by fibrosis
...so you may have scars
or fibrosis after treatment and commonest site is upper lobe but this is not a sign of active infection....
node enlargement can be due to infection including TB, malignancy, sarcidosis, etc.....It is better to go for a simple test called FNAC at pathology centre and the report will tell the cause of lymph node enlargement...
better meet your doctor for the same....