Hello Miss Worrier.
I certainly have pain with my parastomal hernia at times, but I thought that the pain just goes with the condition. There seem to be certain things that can make the pain worse, which I try to avoid. These are things like trapped wind or waste, which put pressure on it until such time as the pressure is released. Hence I try to avoid a diet or activity that might create this condition.
I also use a hernia belt, which I must admit does not help much with avoiding the pain, but it does give me a bit more peace of mind and confidence that maybe the hernia won't get more problematic than it already is.
One thing that I did find was helpful (for a while), was using the stoma plugs. The plugs managed to get past the hernia and open up the passageway at that point to let trapped air out ( the plugs are porous). I don't know whether this would be of any use with an ileostomy as these have problems of their own that are different from colostomies. In any case, the plugs sometimes caused the very problems I was trying to circumnavigate, because they would get pushed out by the peristalsis and put pressure on the outside of the stoma, which was just as bad in terms of pain as the pressure from the inside.
The short answer to your question is therefore, that I have the problems, but don't have any suitable, sustainable solutions. I do hope that others might chip in with this thread and come up with other suggestions.