Welcome. Your case is very interesting and timely.
After a recent (nasty but hopefully acute) bout of Gastritis I did some research I’ve posted in #research-theories-controversies (access for Trust Level 2 users gained through positive forum engagement)
It turns out the MAV diet almost identical to the diet promoted to help Gastritis and GERD. Can this be just a coincidence or does it share a common aetiology? Not only that but the head position at night (slanting body upwards so head is higher) is also prescribed in both conditions. Could it be that #gerd plays a role in upsetting the Eustachian Tube or inner ear? The enzyme Pepsin (only created in the stomach) has been found in the middle ear.