Oh, I'm so sorry...I know exactly how you feel, my little baby bunny broke her hind leg 5 weeks ago. She held it tucked under her belly, that's how I knew it was broken. Later confirmed by X-ray.
It was suggested by the vet that I isolate her in an aquarium tank...I kept her there for 3 weeks,plenty of water..she was and still is constantly licking and grooming herself. I sincerely attribute this to her full recovery in 5 weeks that she has made. Plenty of fluid, pellets, hay and fresh lettuce. Good luck...please update