Is a hiatal hernia the same as a diaphragmic hernia? My endoscopy results use both terms so I'm confused. Online it seems a diaphragm hernia is worse.

Same thing. There's a natural hole in the diaphragm through which the esophagus passes to deliver food and drink to the stomach. When this hole stretches out, the stomach can go up in to the chest (herniate). Small amounts of stomach (small hernia) should be ignored. Large hernias are also called paraesophageal hernias, and should be considered for surgical repair. Hope this helps!