Phelgm and little invisible lump. To do.

I have tested postive of covid In April and tested neg in May but the phelgm and breathless presisted so doctor told us to do a hrct chest and it came normal attaching the CT scan report then she said it's allergy it it went away but sometimes now also phelgm occurs its white in colour .and I got to know that one of mg friend has tuberculosis and I came in contact with her in January and I am observing and lump in my fingers which is not visible with the naked eye can be felt on touch only .I am really scared this can be signs of tuberculosis. I am really worried .what to do.the hrct is done when i am suffering from breathlessness and unstoppable ohelgm now it occurs sometimes.please help what to do