Advice please. 3 weeks ago I felt more short of breath and run down, after a week I went to see dr he said my chest was clear but if feel worse take antibiotics and steroid rescue pack I was given. A week later still no better I took the course feeling a little better. 3 days after they finished I am worse. So today got a urgent appointment and saw a different dr who said I have no infection. But go for urgent X-ray to rule out cancer!!! So no medication and worried sick. Also if it were a exersperation does it make condition progress and ideas please?