I read your previous post and it seems quite complicated for this forum which is why you have not received any replies but dont give up. I too am having digestive problems although not as severe as you. I have been to several doctors for the same problem and not one of them can tell me exactly what is going on and they quickly dismiss me. Some of your symptoms are similar to mine and I can offer this advice.
Search for Celiacs Disease or Gluten intollerance both of these issues are realted to a protein called gluten which is found in all wheat, barley and rye products. Almost ALL doctors that see patients with our problems instantly diagnose us with IBS. ANything with a "syndrome" on the end of it just means they dont know what is wrong.
Please search the above conditions and see what you think. I have seen 3 doctors, told them I think I may have Celiacs disease and they just looked at me and said "I've never heard of that." Pretty scarry. Let me know what you think.