TCM....how you doing? I don't take Metamucil or anything other than Gas-X for whenever I have gas. And I don't have those issues and I thank God that I don't. However, like I mentioned to MEMA 1 I watch very closely everything that goes into my mouth. That's important to me. I believe that's what's been helping me. I don't eat bread but I make a soft taco from sweet potatoes and flour. I'm sorry that you likewise having difficulty. Whenever I know I have to go out for whatever reason, I usually don't eat before leaving the house and I will take 3 Imodium tablets just to be on the safe side. Normally, I don't eat out either. That's what works for me.
I would start off taken it easy with whatever your eating to start to process whatever could be the cause. I would eat boiled eggs, oatmeal, or a hot cereal for breakfast, eat an easy lunch like a sweet potato or white potato with chicken and a veggie lightly seasoned and maybe try eating some applesauce. And of course water. I would take it easy for at least a few days to see how everything works out. Use the process of elimination for a while just to see if there are any changes.
Again, I'm sorry your having issues as well as MEMA 1. Take care my dear and have a fantastic day.