I have had this problem my whole life, like the original poster, I have had upper and lower endocopies as well as small bowel capsule test(where they make you swallow a camera and it records its voyage) I have had H pylorri tests as well. THe results came up negative for celiacs, ulcers, or anything useful. All the can tell me is that there are signs of irritations in your small bowel, and that it appears that there are small tears that have appear and heal. They also put my on prilosec,protonix,reglan, etc... it was a ridiculous amount of medication.
The conculsion is that every morning I wake up just like you in serious pain, it has come to the point that I am depressed because the whole morning I spend in pain, without a full nights rest. I can get vicodin and valuum but then I get no work done. My doctor prescribed marijuana but it just like vicodin only masks the symptoms. However it does release tension in my guts and sometime i can get back to sleep. but once again, I am on drugs for something doctors cant figure out. It is very painful, and I hope we can find something to cure this obstruction in nour lives.