You must see a doctor immediately to determine your symptoms' cause. It could be anything from a stomach virus to a foodborne illness to a more serious condition. Your doctor can run tests to determine the cause and provide the appropriate treatment. In the meantime, it is important to stay hydrated by drinking plenty of fluids and avoiding foods that could worsen your symptoms. 

It is better to see a gastroenterologist who is an expert in the treatment of Crohn's disease for a consultation. Frequent bowel movement is a common symptom of this condition and there are several treatment options available. Adult diapers is not permanent solution

You mentioned numerous problems that have tortured you in the last 2-3 months - like nausea, fullness after a meal, and heartburn. That can be a sign of anxiety. However, you say that they tend to become aggravated during high-pressure situations such as exams that may lead to that. Anxieties can lead to digestion problems and anticorrelated symptoms. Do some techniques like deep breathing or walking to reduce the stress level. Smaller and more frequent meals can also be of help to avoid your pain. 

The side effects of overdose omeprazole are, for instance headache, nausea and stomach pain. If you have any of these symptoms, seek advice from your doctor as soon as possible.

Issues like gassy bloating and acidity can crop up afte­r operations. That's because of change­s with medicines, stress, or new e­ating habits. Smaller meals, staying hydrated, and skipping spicy or gre­asy food might help. However, if it doesn't improve, he­ may need to check in with his doctor.

Okay you can try a few remedies to find relief. Drink warm liquids like herbal teas or warm water with lemon to relax the stomach muscles. Avoid carbonated drinks and chewing gum as they can contribute to gas production.