Please help, sleep training!

Cece

My daughter is almost 7 months old and we still have to rock her or I nurse her every time she goes to sleep. It's becoming a serious problem in our lives, my husband has to nearly wrestle her to sleep and she responds best to that. If I rock her she demands my boob, or I have to wear the baby carrier to rock her. It gets to the point where my nipples are raw from her comfort sucking, she's only been wanting to cosleep lately. We're both literally so sore and exhausted. She still wakes every two hours at night for a feed. I'm not sure what to do, and I don't really believe in crying it out, especially since we live in such a small space that we room share.