This situation is caused by many years of digestive problems that resulted in backflushing of waste from the large and small intestines into the stomach and up from there into the esphagus, chest, throat and head (see details in The Key to Health and Rejuvenation, ener-chi.com). To call this a disease would be misleading. The valve doesn't close for a good reason. There must me an open outlet for waste to be eliminated upwards ,which otherwise could cause much more serious problems than ulcers. The stomach has no other choice to respond this way. The stoamch muscles will revert back to normal when the backflushing of waste has subsided.
To achieve this, the intestinal tract must be cleasned out. I suggest a combination of a magnesium oxide such as oxy-poweder and a series of colonic irrigation. In addition, diet and lifestyle must be adjusted to suit your body type needs and optimize the digestive process. Avoid any animal products, including meat fish, eggs, and poultry, processed foods, frozen foods, microwave foods and junk foods in general. Eat mostly alkaline-forming foods, such as cooked vegetables, salads and fruits. Cooked grains and legumes are fine as well. No tamoto sauces, vinegar dressings, sugar, coffee, nutbutters, milk, cheese. See details in the book.
Also consider doing a series of liver cleanses to remove intrahpatic stones and increase bile secretions, required for proper digestion (see The Amazing Liver Cleanse, ener-chi.com). Rembember, it is harder for the body to maintain the abnormal sitaution than to fix it. You can set the preconditons for the stomach to heal itself, even if muscles have changed. If there is mechanism to injure them, there is also a mechanism to heal them again. The DNA doesn't forget its own blueprint.