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You need some further tests to find out why your are short of breath.
1. a repeat chest x-ray to see if the infection has resolved
2.pulmonary function tests ( breathing tests) to see if your emphysema has worsened
3.a CBC to exclude anaemia ( a common cause of shortness of breath)
4. if these are all normal then an echocardiogram to exclude heart failure
Anything else that I can do for you?