I'm sleeping on the couch- here's why

Long story short when i was 6 I was in a bad car accident and got thrown from the back of the car into the front literally forever screwing up my back. If I do something to irritate that injury or re injure it somehow the muscles swell and push on my sciatic nerve. It's painful. The couch is amazing, I can lay back first into the cushions and it's like heaven. In the bed I'm tossing and turning and there's so much pressure on my hips that it just causes me to ache more than I already am. So I've been getting up and going to the couch and my SO has a bad attitude about it. He wants me to sleep next to him. I tried explaining my reasons and he says "so this is just what you're gonna do now, sleep on the couch?" Like uh yeah until my back stops killing me again. I just don't know if I should feel as guilty as I do. I feel bad for this but it's the only good night sleep I can get. I just wish he would understand. And of course I've been to a chiropractor. Ive had this since I was 6.