Lymphoma symptoms. Is it post tb effect?

1 year ago on May 2022 my husband was detected mediastinal lymph node tb by ebus Fnac in Apollo hospital. After 7 month of medicine we did CECT the size was regressed from conglomerated 7cm to one was 1.2cm and other was 1.5cm doctor advised to take medicine for 2 more months and then we finished 9 months course. Now he is doing well no fever no weight loose no loss of appetite. He is professor he is taking classes. But only problem of which I'm worried is he sometimes occasionally cough like 8 to 10 times daily mostly at evening and night after gap of half an hour or 1hour. It is like happening since he affected tb. Previously due the mediastinal lymph node he can't even talk because of cough and airway compression. Now everything resolved but sometimes occasionally cough. Is it post tb effect? His pft test report was restrive spirometery significant liability noted in small airways But sometimes I am in fear of lymphoma leading from tb. But i can't do CECT everytime. hs a non smoker