Can’t Breathe Without Food

Patient: I put this under Asthma because it’s the closest to the problem. For the past few years, and very often I have been having trouble breathing. Here’s the catch, it’s only when my stomach is empty. I’m a classically trained singer, and we are taught to breath by expanding (dropping) the diaphragm. I literally CANNOT do this without food in my stomach. It feels like my lungs just stop. This is a huge problem as i continue to sing more and need more breath. Is this related to some sort of breathing disorder, or is it connected to stomach tightness? Thanks