Hello,
Welcome to icliniq.com.
I can imagine the level of your frustration for your chronic unresolving symptoms. And I really feel sorry to hear that you been back and forth around doctors for solution of your symptoms. Well, I can very well understand your problem, I will explain to you point by point.
1. Lax LES (lower esophageal sphincter) is not a uncommon findings on endoscopy. It reflects that the valve which controls reflux from stomach to lower part of food pipe is little bit open. However, your endoscopy did not show any ulcer formation in the food pipe which suggest you do not have Gastroesophageal reflux (GERD). Again your symptoms are not related to GERD. It is something else. I tell in a moment.
2. So you see the fundal gastritis (inflammation of the fundus- a part of stomach). Usually inflammation of stomach confines to the other parts of stomach -like antrum and stomach body, but not to the fundus. The one cause of inflammation predominantly to the fundus suggest H pylori infection. This bug initially infect antrum of the stomach then it moves to fundus if chronic infection that has not been treated. I will suggest you investigation before I suggest you an antibiotic course of this H pylori. And remember this H pylori can cause stomach slowing leading to your symptoms of gas. The condition is called gastroparesis. Below I explain to you in more detail the reasons of your symptoms of gas.
3. To simplify the constellation of your symptoms, we doctors classify in to two- the predominant gaseous symptoms or predominantly pain symptoms. You have predominantly gaseous symptoms including bloating, sounds, burping, fullness, early satiety after meals, and some gas in stools as well.
So it is important you should understand why these gases production is in excess in you. The one such reason is:
i) Dysbiosis-which is alteration of human gut bacteria more gas producing species. These bacteria or harmlessly present in the human gut, however; at times the environmental factors, food, water, other dietary habits; change the composition of these bacteria and turn them in to gas producing bacteria. I will give you an antibiotic for a 3 week duration, this will correct your dysbiosis.
ii) The other reason is excessive of food intake that produces gases. These foods are collectively called as FODMAPs (fermentable oligosaccharides, disaccharides, monosaccharides and polyols). These foods to be avoided as possible as you can. I will share with you a link where you will find the list of such foods which should be avoided.
iii) Less common mechanism is feeling of normal amount of gases-this condition is called hypersensitive gut. For this I would suggest you behavioral therapy called diaphragmatic breathing. I will share you the link how you can exercise it at your home.
I really hope now you would the some idea of mechanism causing your chronic unresolving symptoms. I would just correct your above mentioned mechanism, and you would see the things get improved for you. Please find below treatment plan, and I want you should update me about your symptoms in coming 2 weeks time. Secondly, I also want to suggest you some investigations as we can exclude any other possibility and treat the things accordingly.