For just the butt burn question: For most people it clears up during the first year. It's best prevented by a barrier cream after each BM (in preparation for the next one). It just never gave me a problem. I think some folks have other issues that may also cause burning pain (e.g. Cuffitis), and that gets mixed in with garden-variety butt burn.

Question 1:

No,  I never experienced shooting pain in my groin area, I never experienced any pain whatsoever from the surgery,

I didn't even use the pain meds which were on some kind of push button pump.

Question 2:

During the first week of my J pouch creation I had a blood drain in my abdomen, but I never looked at its output;  I had open abdomen surgery, so my movement and mobility was restricted.

The mucus output from the J pouch seemed as if it was never ending.

Initially, so I've been told, there was traces of very dark old blood, which is normal but by time I was able to see the mucus output myself, there was never any traces of blood whatsoever.

10 days since my J pouch surgery, the mucus incontinence had stopped and I was able to evacuate the mucus like I would a BM; there was a few mucus accidents during my sleep, although I wore diaper/nappy type boxer shorts during my sleep for maybe 3 months.

Question 3:

I've never experienced butt burn.

Just after takedown, for maybe 2 days, I did experience an excruciating pain during BMs, which was initially diagnosed as butt burn but it turned out to be anal fissures, caused during dilation of the anal canal.

The nearest I've experienced and I assume on par with butt burn, was the erosion and burning of my skin around my Temp Loop Ileostomy.

I eventually discovered a product called ilex Protectant Paste, which provided instant cooling releif and made all the difference, healed the festering and oozing skin within 3 days.

The ilex paste can also be used to treat and prevent butt burn.

I continued to apply the ilex paste all around my Stoma, as a preventative measure.

I always say, "it's best to have ilex paste and not need it, than need it and not have it."

I did have that excruating pain and it did eventually get better but it was tough and seemed to be much worse at night.  

Butt burn is irritating but manageable.  Get some ilex skin paste, it is amazing!  I am just about  4 months since take down and the butt burn is far and few.  

Good luck to you on your take down, this next surgery is a breeze in comparison .

I'd chat to your medical team about the first two questions. I expect the mucus varies from person to person - I was told to expect it but didn't really get any. However I can imagine the opposite is true from some people.

I'd never heard of butt-burn until I found this site, years after getting my pouch. If my skin got a bit raw from going to the loo a lot, I just rubbed any cream on it, and that did the trick.