Hello, Lovelife.
When I have pouchitis, I drink bone broth (I make it myself but you can buy bone broth, or just a clear canned veg broth). I add some pieces of chicken or beef to give it some substance. Also add cooked white rice. Add some chopped up broccoli or well cooked carrots. You can cook all this in the broth, just use more broth because it will cook down. Keep it to soft foods and fluids, but all nutritious so that the little bit of food you are able to tolerate is packed with protein, vitamins, minerals, and so your pouch doesn't have to work so hard passing food. I also eat fish when feeling unwell because it's soft protein. Scrambled eggs or tofu, yoghurt with sliced banana, or peanut butter and banana on toast. Or put your favourite foods into a blender with broth and purée it to make a warm soup with yoghurt on top.
Have you tried a sitz basin to help heal the fissures? It will bring blood flow to the internal cuts to heal them. They come from straying too hard. I hope some of these help you.