Hi
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Pain, discomfort and stomach cramps could be acidity or heart burn. This could be causing the burps. The other reason could be due to esophageal reflux (GERD), where the food in your stomach is thrown up into your food pipe or esophagus. Another possibility is hiatal hernia, where a portion of stomach herniates into the chest cavity through the diaphragm. This causes acidity like symptoms and burps too.
Treatment is a combination of drugs to reduce the acid and lifestyle changes. You will need to take a combination of medications like omeprazole and an antacid gel for complete relief.
Avoid heavy meals and eat frequent small meals. Avoid too much of caffeine, tea, smoking, fried food and drinks both alcoholic and non alcoholic fuzzy ones. Avoid heavy exercises within 4 hours of a heavy meal. Raise the head end of the bed by pillows to 30 degrees. Go to bet at least 2 hours after food. Maybe these tips will help you. You should see a gastroenterologist (a specialist who looks after the diseases of our digestive system) or a physician for this if these tips reduce your symptoms. Hope this helps. Take care!
Did they check for cancer markers in your blood? Did they check for gastroesophageal reflux disease or GERD? Have they ruled out hiatal hernia? Did they check your gall bladder function with a HIDA scan w/ejection fraction? Did they do occult blood testing in your stool?
Is it hard to walk because of your stomach cramps or for some other reason?