Hi Gerd. I have a J pouch (2017) for UC and I also have Addison's. I also do sports (or at least keep fighting the good fight to continue kayak and canoe rack g and cycling. I have had episodes of pouchitis for which Flagyl works moderately well. I have fissures frequently with spasms, burning and pain.
Addison's is hard to deal with. I get fatigue, muscle spasms, weakness, strange tight dluttering in abdomen, thin fragile skin with easy bruising. At times, the abdominal muscle contractions are very strong and uncomfortable and I cannot exercise when this happens. My sleep is poor most of the time.
Just thought I would share and support you as my journey sounds similar. Take care. BTW my Hydrocortisone dose is almost physiologic at 22.5 mg daily divided into doses: 12.5, 5 and 5.