Hello I am also 37 and I am over weight, I weigh a little over 300 pounds. I also have discomfort with middle of chest. Ex. when I sleep on stomach and if I push myself up, middle of my chest is bothersome. The discomfort lasts about 15 seconds and goes away, it always happens when i lean frontwards or when I bend over to pick up something and while Im in motion to stand upright is when this discomfort happens. Any possible reasons why?