I had the exact same problem and I posted it in the exact same manner. Being too skinny post op my bag wouldn't stick well and needed to be changed every 1-2 days. Plus all those foods I ate burnt badly as they came out . I couldnt sleep well always worrying about a leak. And skin piercing pain at the stoma site . My surgeon wanted to do the takedown in 8 weeks and I wanted to give it 12-15 weeks to heal but due to so much pain and irritation I went back 9 weeks later and got done with takedown. It took a month for my pouch to settle enough to get going but since then it has been absolutely amazing.
I am sorry I couldn't help as I never found anything that would stick for long. Though at a point I got very high quality fully covered bag which stuck for almost 5 days each those 10 days were the best for me with stoma. If you can get such a variety it'll help your skin to grow back and the irritation will reduce .
Try eating less fruit . Only go for potatoes, breads, butter , eggs , chicken and bananas ,they I found were the easiest to cone out without irritation.