Welcome to e health forum.
All your symptoms are most probably due to peptic ulcers and related gastric reflux.
Since the ultrasound has shown the liver and gallbladder, to be normal conditions like gallstones or fatty liver have been effectively ruled out.
Gastritis pain occurs in the left upper portion of the abdomen and in the back. The pain seems to travel from the belly to the back. Other symptoms of gastritis include - Belching, Nausea and vomiting, Bloating, Feeling of fullness or burning in the upper part of the belly.
First and foremost, you need to avoid foods, smoking and stuff that worsen your symptoms. Foods that need to be avoided include -
1. Alcoholic beverages, caffeinated drinks, carbonated water, and deserts high in sugar and white flour
2. Foods prepared from white flour, like puddings, breads, bagels and pretzels also should be avoided.
3. Vegetables such as broccoli, cabbage, all kinds of beans and legumes, full fat milk, onions and green peas should be avoided.
4. Nonvegetarian foods to be avoided include - cured meats and high fat meat products such as sausages, salami, ham, bacon, and cold cuts ;Red meats like beef, lamb, and venison - should be less in your meals
5. Seasonings such as onion, garlic, clove, and cinnamon may irritate your stomach lining and worsen the symptoms due to gastritis
Foods that can help to improve your symptoms include
1. fruits such as pears, oranges, sweet limes, watermelons, cantaloupes etc
2. MILK products like - yoghurt and cottage cheese
3. Non Vegetarian food products - include - lean cuts of meat, white meat from chicken and turkey, and seafoods
Other measures that can help you in addition to the above dietary measures include -
1. Walking or running thirty minutes regularly and achieving significant weight reduction.
2. Stress reduction
3. Learn to relax with breathing exercises like Yoga
In addition, you might consult with your gastroenterologist for proper treatment with anti ulcer and acid reducing medications. In addition treatment for H pylori infection of the gastric mucosa can also be initiated after due testing.
I hope this helps.