I'm really worried because I've been having some trouble with my breathing and caught a cold, so my doctor had me get a CT scan. It says "no significant abnormality detected," but Im still feeling off. Can you help me understand what might be going on? Could there be something else causing my symptoms that's not showing up on the scan?

probably you might have high cough or increased sputum ,to rule out some respiratory causes they would have taken CT scan