Hi i have a problem with my stomach i noticed its when i eat gluten but even when i buy gluten free things my stomach is still upset what else could it be?

I assume you use the wrong term stomach instead of abdomen. When you have celiac sprue you still have abdominal symptoms such as gas, bloating, cramps or diarrhea, etc. when you eat gluten free diet but the condition and symptoms are even worse if you are not adherent.

Be advised that there are many products that you're unaware of that contain gluten. Some are medications, vitamins,boullion,fried foods dipped in oils contaminated by gluten to name some.