Yes, calcification (plague) of arteries and valves are aged related, some more than others. Breathing problems can be heart related (shortness of breath) and successfully treated. Also, it may be a respiratory disorder that can stress the heart.
I don't find any information that supports the thesis that hiatal hernial causes breathing problems.mall hernias:
Most small hiatal hernias cause no problems.
Large hernias may cause the following signs and symptoms when stomach acids back up into your esophagus causing heartburn, belching, chest pain, nausea.
These signs and symptoms tend to become worse when you lean forward, strain, lift heavy objects or lie down.
In rare cases
Sometimes, the part of your stomach that protrudes into your chest cavity may become twisted (strangulated) or have its blood supply cut off, leading to:
Severe chest pain
Difficulty swallowing (dysphagia)
Obstruction of your esophagus
Your mom should be dx'd for the breathing problem as it can be heart related or a serious respiratory disorder.