are great questions, but are questions that would probably be best to ask your
physician. The people posting on this site are not physicians. Any advice that
is given here is given by lay people based on their experiences in dealing with
the same situations and based on their research. Some people may feel breathless with only mild exercise (for example, climbing stairs), even though they do not have a medical condition. Others may have advanced lung disease but never feel short of breath.
I am sorry to read of your problem but please do see you physician for a medical screening exam to rule out any serious physical problems you may have developed.