What causes abdominal discomfort with flatulence?

My bilirubin has been consistently elevated for over 20 years during blood tests. It usually stays around 1.7. All other liver function tests have always been normal except this time my white blood count was just ever so slightly up, the doctor said not even enough to mention. I have been having some discomfort in my abdomen mostly on the left side 2 or three inches below the rib cage and every now and then I get a dull discomfort on my right side just below my rib cage. Sometimes the discomfort level raises for a split second or two the goes away. My abdominal discomfort has been off and on for most of my adult life. It started in my early 20's and I'm 52 now. No major pain just slight discomfort (1 on a scale of 1 to 10 and 10 being severe). I've had ultra sounds in the past all have been normal with the exception of an ulcer or two several years ago. I am physically fit about 5' 11" and 175 pounds. I have been around 175 for ten years or so, before that I was 160ish. After I eat I sometimes get lots of gas and my stomach churns and churns. What could be my problem. Each time I look on the internet it leads to liver or pancreas disease. If I had liver disease would my other liver function test be out of the normal range since my bilirubin has been slightly elevated for over 20. I have another ultra sound scheduled for tomorrow. Should I be worried about liver disease, hepatitis or pancreatic cancer. I do have shortness of breath from time to time without being active. I can just be sitting around and have shortness of breath. The more active I am the less I notice it. My blood work for triglycerides and cholesterol was good as well.