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The problem might point to appendicitis, the inflammation of the appendix. At times, pain takes place quietly, but if it is worse, don't overlook it. The signs of appendicitis might involve the patient having high fever, nausea, and loss of appetite. Don't hesitate to go to the emergency department as soon as the suspicion of appendicitis arises. Surgery could become a necessity in the process of getting your appendix to remove it and thus keep it from rupturing. 

Bile duct injury, gallstones in the bile duct or pancreatitis may be responsible for persistent right-sided pain two years after removal of a person’s gallbladder. It is recommended to see a gastroenterologist

There could be many reasons for gas and acidity after bypass surgery, including diet changes, stress, medications, or surgery itself. Some of the symptoms can be bloating, burping, and heartburn. It is important that you advise him to take smaller meals, steer clear of spicy foods, stay upright after eating and ensure he takes sufficient water. In case none of this seems to help then do not hesitate to contact his physician immediately.

Experiencing chronic constipation and having B12 levels at 350 and vitamin D levels at 27 ng/mL might require medical attention. Your doctor can assess your levels, determine if supplementation is necessary, and guide you toward appropriate treatment for both constipation and potential deficiencies.

IBS patients often experience a sour stomach, leading to symptoms like bloating, cramps, and changes in bowel habits. Certain foods can worsen these symptoms, such as dairy, spicy foods, caffeine, and artificial sweeteners. Eating small meals, drinking enough water, and avoiding trigger foods can help. Fiber-rich foods and probiotics may also be beneficial. Since everyone is different, keep a food diary to track what works best for you.

If your blood test shows that anti-HBs is positive, it means that you have antibodies against the hepatitis B surface antigen (HBsAg). This result indicates that you are either immune to hepatitis B or have been successfully vaccinated against the virus.