Help. Feel Air in my chest

Hello all. I haven't posted in a long time but thought I give it a try and see if anyone has had the symptoms I have had.

I have bad acid reflux. I had an endoscopy in March that showed I have a hiatus hernia and the bottom my esophagus was irritated, however. I been feeling like I have air in my chest and im waiting for my heart to flop. hard to explain. its a weird feeling in my chest. Like air or hollow. does anyone get this???