it isn't necessary mistaken. The issues like GERD and some other around stomach/digestion affect how your muscles handle the diaphragm and that may strangle the

it isn't necessary mistaken. The issues like GERD and some other around stomach/digestion affect how your muscles handle the diaphragm and that may strangle the breathing in various ways and also obstruct heart beating movements - that all limits the oxygen supply, and while sitting relaxed doing nothing the oxygenation may be sufficient it struggles to cover any additional increased requirements which spike due to increased body and/or brain activity, and that insufficient oxygen delivery naturally makes one feel anxious.