I am experiencing loss of breath. Not able to run anymore and difficult to take a full, deep breaths. Symptoms now for 5 months or longer. I ve had multiple heart test and all have come up negative (stress, echo, 24 hour, etc). The ability to breath is much harder when bent over or laying on back. I think i had undiagnosed pnuemonia early this year and wonder if this could be some type of long term or permanent damage to my lungs. I can walk and do normal activities, but anything more brings on a definite lack of breath. Thanks