Lung Cancer Question

I was diagnosed before for preliminary tuberculosis because of minimal ill defined densities in the right upper lung & it had been treated for 6 months,but after 3 years there is another one,it diagnosed thin linear density in the right lower lung,and the impression: right upper $ lower lung fibrosis. Is it possible that it is preliminary tuberculosis again or there is another infection aside from preliminary tuberculosis? Am I going to undergo 6 months treatment again?Actually I am currently working right now in eng'g dept,we have an annual medical check-up,& it happens every july,last year my x-ray was ok. I don't know what should I do because there will be only 3 months left before the annual medical exam again. Is it proper to resign now or should I continue work & wait for july? Hope you can reply me as soon as possible.I really highly appreciate it.Thanks.