Hello there,
Need not worry, it's a very common sign of dehydration and Deficiency of few micro nutrients.
Pathological findings are reinforcing the case.
Please start taking 3-4 litres. If feasible, have a green juice detox diet for a fortnight.
Next Steps
Take up any sport, your diaphragmatic exercises will happen automatically (prefer cycling on road)
Health Tips
Pectoral tightness can also make similar symptoms.
Feel free to communicate with me.