i cant breath in deeply

for the past couple of weeks ive been having pain when i breath in deeply.
the pain is under my shoulder blade the deep i breath the stronger the pain gets.
at first it started not to strong but now im finding my self hard to breath.im really worried
can i get some advise on what to do ...thks

[National Jewish Health]

If this is increasing in intensity rather than going away, seeing your physician for a physical examination and possibly an x-ray is a good idea.  There are several reasons that could cause this from relatively mild to serious illnesses.  Rather than speculate on a forum, see your physician.