My elder brother is in army job, he just completed all the 15 quarantine days in an isolation ward in suspect to COVID 19. He had cough, fever and weakness for 1.5 week but after several tests he founded out to be COVID negative. Due to strictly rush duty schedule, he has to start his daily job even after he is not fully recovered from the weakness and has a weird breathing issue of getting a ugly smell of something like old phlegm while inhaling and exhaling and a feels like burden on lungs. Is it somewhere related to not getting enough rest time or something more serious is hidden? Please tell sir/madam ,