I have an upper abdominal pain. Work?

I have an upper abdominal pain many times a day and goes on everyday. I experience sever headaches and fatigue and I easily get tired. Frequently, I feel dizzy. I experience all this while having my abdomen ache. At first, I thought it was just a stomach ache until it goes on everyday. And it hurts on the part above my stomach. I've taken pills my second doctor told me to take and my school clinic nurse, but nothing happened. I went on for checkup with 2 doctors already. The first doctor told me that there is nothing wrong with my stomach, he said that I may just be too stressed and frequently tired. The second one told me that I have a fatty liver and so I should just exercise. I've been exercising already starting from 3 days ago and I've been also eating a lot of vegetables and healthy foods with rice and have been reducing eating oily foods. Today's just my 3rd day on doing so. Will this work? I still feel the same pain.