Duck11, Glad I could help a little! It's a very specific issue and you'll know more after the defecography and scope. It's not a perfect system but over the years it's become easier to use. I've figured out a routine that works for me. Now is probably not the best time to ask me because I'm having some unexplained pain...but...normally I use it between 3-6 times a day and I don't have any pain. Occasionally some gas pain but nothing terrible. It's kind of like using an enema but the catheter is a little wider. It takes some getting used to. I irrigate with water and a bulb syringe if it gets clogged. Sometime I have to take it out and irrigate it out and reinsert. Not as quick as just going to the bathroom but I've become fairly quick at it.
I should preface all of this by saying I went through a lot to get to this point. I had 2 ileostomies leading up to this. One was for a full year to give the bowel and pouch a rest as they were very distended from not being able to empty on my own. Hopefully, you're not to that point. Give the catheter a try instead of the enema. If you can insert it and get the stool out then I would think that would help with the pain. It's been a lifesaver for me. I also take Miralax everyday to keep things loose which makes using the catheter easier. Feel free to ask more questions. I know when I looked for info on this specific problem I couldn't find anything either. I wish you luck!