Hello, Erica. This is a difficult time for you. When I had bad butt burn after reversal I bought a sitz basin (approximately $12 on Amazon or at pharmacy) that fits on the toilet. It was soothing and helped so much to heal the burning, raw skin. And the very warm water was just soothing and comforting to sit in. Try not to strain even though it's so frustrating to sit with nothing happening. Straining will make more fissures or swelling inside and make it worse. Try leaning back a little bit, as if resting on a sofa ( just don't put your full weight on the toilet tank).
I hope they will be able to give you solutions and help you.