Weak muscles of digestive tract.

I am suffering from a strange type of stomach disease. I feel my stomach muscles like rubber. Intestinal tract is unable to digest food properly. Usually i can't digest food within 24 hours. I can't poop in morning. i have constipation but stool is always semi liquid. Frequently i have emergency to toilet & sometime i poop in pant. My stomach muscles are too weak and can't bear, exercise and when i do exercise my stomach muscles feel like rubber or plastic instead of help in digestion. I am also a type 1 diabetic . I have visited many gastroenterologist but couldn't get relief. Dr.s refers me to psychologists and can't understand my disease. They think i have psychological issues. I am facing this problem for 15 years due to which i am suffering from physical and mental weakness and unable  to live a normal life  now i have lost hope to get good health. Can anyone determine root of my illness ?