For the past 7 years ive had problems with getting a satisfaction feeling when trying to take a deep breath. I one day went to take a deep breath and my chest was just stuck and wouldnt expand and has been like this ever since. After this episode i constantly have to urge to take deep breaths and yawns and never get satisfaction which has lead me into a cycle of anxiety and depression. My ribs and sternum dont expand, and just recently ive been experiencing pain and cracking sounds in my sternum. What is causing my ribs and sternum not to expand, and can i get any help with this?