Same problems with me...

My food passes relatively fast through first part of my digestive system(stomach, small intestines...). When it reaches ileum and colon it starts to irritate them (where are my general problems). I have crohn's disease and i'm absolutely sure that factor number one for that are heavy metals - mercury, lead and probably aluminum.

I have the same symptoms and vitamin C makes my food to pass faster through the colon and ileum where is the inflammation. It's like vit C stimulate the nerves and immunity and makes bowel to throw away the contents faster as it possible.