I would be very skeptical about their ability to help a hiatal
hernia. Chiroprators manipulate joints. A hiatal
hernia is soft tissue and I wouldn't want one messing around there.
Some other option you may want to try - probiotics, digestive, enzymes, and carrot juice. My compounding pharmacist also recommends taking acid to aid digestion. The reasoning makes sense to me, but it is rather expensive. Let me know if you would like more information on that.