Re: the asthma - I developed mine when I moved to London. I've had significant phases of good and bad, coinciding with the location of my job. The closer I was to a main road junction (Silvertown Flyover, A13, A12, anything along there), I was worse. The year I spent near the Silvertown Flyover, I was up to an attack a month. I moved out of that library, it practically cleared up over night.... Mine didn't get helped by an untreated chest infection (oh, it's just a cold, take 2 asprin, see me next week sort of Dr....) that turned into Pleurisy. Now I get every chest infection and bug that's going. The important thing is to rest up. Don't be doing that jogging round the park thing! Get as much rest as you can, and start back slowly.
Hope all is well still, and that the X ray isn't horrendous.