This is an old post, so if your rabbit hasn't pulled out of its depressed state, I would smoke some "alfalfa" with it and give it gaterade. this works for a lot of animals. If I wasn't strictly a rodent psycologist, I would say you may be projecting your own depression on the rabbit and making it depressed. Lops, while always looking depressed with ears down and such, are often very content and just kicking back. My rootmate had a moody Lop that would become shy and wouldn't eat then be fine a week later.