Changing opinions - Middle lobe collapse, pectus excavatum & pneumonia?

Hey all. About 3-4 weeks ago now I became sick. Went to the Doctors and was told it was an upper respiatory infection. Not unusual. I work in Childcare and get sick alot. Was put on antibiotics for a week. 1.5-2wks later, I went back as I was having more trouble breathing and was coughing non stop. Was sent for an Xray which returned saying "Obscuration of the right heart border, suspected medial middle lobe collapse". Went back to my GP, who said I have pneumonia and to take 5 more days of antibiotics and I should feel great. I had a repeat script just incase. Up to day 7 now, still feeling out of breath, no energy chest pain etc.. sent for Xrays again. This one says no collapse or consolidation noticed and that there is mild pectus excavatum. Dr still saying pneumonia. Any idea what all this means? I am sick of the stuff ups!