Thanks and hopefully that will help. I have been going through something similar. Have been experiencing months of upper left abdominal pain that radiates to the back, that comes and goes. I haven't experienced much weight loss, but do feel like I have been losing muscle strength and mass. Similar to you have gone through many tests (blood, multiple CTs, colonoscopy, endoscopy, etc.) and doctor's are saying they have ruled out cancer, but the best they could do for a diagnosis is "functional abdominal pain". While it's good they have ruled things out, it's easy for the anxiety to still think the worst when there isn't a firm diagnosis and the symptoms are still there. Really hoping the new diet will make a difference for you and I have recently tried doing the same.