I also have am ilostomey and have found after a lot of thin liquid all the time, and getting dehydrated, that I needed to eat every 2-3 hours and eat a lot of carb type foods to thicken up discharge. ( bread, English muffins, bagels, pasta, etc) still need to keep hydrated also.
It took me over 6-8 weeks to find out what worked for me. I'm finally retaining nutrition and hydration. Once this happened I started feeling stronger. I also take 2 immodium when I first get up and 1 immodium after dinner. Everyone is different, with dosing and what works for them.
My skin was also a bit angry when removing bag and adhesive ring, and my nurse recommended nasal spray with steroids in it to spray on the area at change time and that has helped also. I'll have to get the brand name of nasal spray for you if you're interested.
Hope my experiences help and please reach out if you have any questions or need clarification.