Problems with Digestive System Excessive digestive gases. Here's what may be causing your pain and when to see your doctor. Angina often occurs after some form of exertion, such as climbing stairs, but it can occur at rest and even when sleeping. You may need medication or surgery in more serious cases to manage the condition. Pericarditis involves an inflammation of the pericardial sac that surrounds the heart. Hi hanna did u find out what it was???