I don't get pain when peeing but I have to piss constantly. Which contributes to getting little/no sleep.
I've had no experience with Kratom, it's banned in Australia sadly. In theory it should be working in a similar way. The idea behind high dose immodium (20mg+) is that it helps with the more physical side effects beyond the gastro intestinal stuff. But you have to handle yourself with all this stuff (benzos, kratom, even immodium.). They can all lead to nasty dependencies of their own.