You'll have to ask about
limits, every policy is different. Kaisar used to give out all you needed, as long as it was medically necessary but I hear now that they have co-pays and limits. All the insurance companies are doing it now. I never used to have to pay a penny for my supplies (way back when in the dark ages), now I have a co-pay and a yearly limit.
Also, Kaisar didn't use to only carry one type of appliance and I don't see how they can now. If you like your appliance (which most people do because it's all they know) don't worry about
it, but if you're having issues you may want to send for some samples from other companies or different styles from Hollister. If you find something you really like, or maybe before you even start looking, call Kaisar and ask them if they can order specific appliances.
If your stoma is retracting and coming back out, I would say it could be a hydration issue. Or it could be part of your normal paristalsis (spasming of the intestines to move the food along). As long as it doesn't retract and stay that way it's probably okay, except for fitting your appliance that is.
Mine retracted and actually the entire area around it pulled inward, but since it happened over time it was hard to tell at first. Just keep an eye on it. That happened because of the Crohn's.
Now that you've been diagnosed with CD you "should" get better care if you need it. It's that no man's land when no one knows what's wrong that gets most of us. If you ever have to go again, being able to say "I have Crohn's Disease and may be having a bowel obstruction" usually gets some attention. Having said that however, some ER's are just notorious for slow and/or inadequate care if it's not a visible trauma. Now that you have a GI, call him/her before you go to let them know you're having issues, or even your GP if you have a good relationship with him/her. They may make a phone call and pave the way a little.