Brellis,
I am merely suggesting you experiment with it. All treatment of IBD is trial and error.
For me 2 capfuls would do the trick. Read the instructions, you cannot take more than a certain amount per day as bismuth can be toxic to your liver as well. Try it for a day or two and see what happens. The nausea, bloating, and gas should be addressed by the bismuth. If you get constipated, stop it. That should not happen. As I said, the mechanism of action is to kill bacteria, not to thicken or slow you down like imodium.
The PB formulation allows a maximum of 240 ml per day (8 capfuls). Therefore you can take 4 2 capful dosages or 8 1 capful dosages. It is the best to take every half hour or hour up to the maximum daily amount and then you will have the bacteria causing the symptoms crushed. I would not use it for a prolonged period.
Lastly, relief should be immediate. Within 4 hours as that is the transit time to your Pouch.