I think the good news is that it is definitely normal to be going to the toilet that often after takedown - we've all been there! The pain from the staples will pass when your wound heals. Your body has been through an incredible amount, not just during the past few weeks, but the years you've had UC, so all of this is recuperation from that, not just the op. It will take time, but you will get there! I was hunched up for ages - I felt like an old grandpa! I used to stand with my back to the wall, and very slowly try to push each vertebrae against the wall, from the bottom up. Each day I could get a little higher.
Good luck - it will get better x