Hi Junkatarian,
Welcome to the forum. I too tend to get gruelling stomachaches when I eat certain things.
I was doing a specific diet for a few months (for gastrointestinal problems). Then for the last month I was basically just counting calories. Now I'm starting Volumetrics...which is still basically counting calories. I'm not super strict just trying to use it all as a guide to eat healthier and continue to lose weight.
I'm looking for a buddy to share progress and struggles with. If you want to buddy up, that would be great.
Nanaimo