Edith, soluble fiber (like Metamucil, Citrucel, Benefiber, gummies, etc.) is very commonly recommended for J-pouches to bulk up the stool. You are correct that that application isn’t mentioned on the package labels, but it nevertheless really is quite common. My surgeon put me on Metamucil the day I left the hospital, and it has been helpful to me for about 16 years. TCM describes a common practice of reducing the fluid that the fiber is mixed with. I don’t find it necessary, and that does create a small risk of choking. I’m not at all sure why you are bringing up HIPAA - each of us is free to discuss our health situation however we like. HIPAA governs the privacy responsibilities of health care providers, but doesn’t restrict patients’ discussions.
I wouldn’t recommend combining Lomotil and Imodium; it’s likely to be better to figure out which one works better for you and use that one.