I was suggested that I have low intolerance to grain. I get this pain near my navel and then it burns for a few days until I go to the bathroom. Sometimes I immediately go to the restroom after I eat - other days it takes a few days. I notice when I eat spaghetti or a lot of bread - the pain starts. Does anybody have this problem?

It usually means you are intolerant to gluten that is in wheat, barley, rye and to a less extent in oats. And especially the by products,
Rice and corn products do not contain gluten.

This condition is call Celiac Disease-- there is alot of information online about it! Gluten damages the villi in your small intestines causing you not to absorb nutrients properly.