Hi Corbybird,
Sorry you are feeling down about this subject. I hope you feel better soon. If you feel the need to talk to someone do whatever feels most comfortable but please do find someone.
I have a daughter with Spina Bifida and we have done the 'cathie' with her since birth. She is 5 and is super proud about doing it herself now. We even wrote a kids book and published it up on Amazon and we are donating the proceeds - what little there is. My wife is the expert but I have learned a bunch about it. If you want to learn lots of technicals on this subject you should go here
http://spinabifidaconnection.com/ for more.
As far as the nurse's comment about a 'bag'; it sounds like she is referring to a colostomy bag. If that is the case that is old school and rarely ever used anymore. Unfortunately most medical professionals are hopelessly out of date on this subject, so just ignore that comment.
Feel free to PM me.