I had the same problem with my dog, when we got him at 8 months we were his 3rd home. he had serious seperation anxiety if i went to the corner store by the time i got home he would have torn apart the couch cushion, it got so bad he pulled up the carpet chewed the walls and several pieces of furniture. I took him to several trainers and was convinced to try crating. If you psychologist or whatever says its a bad idea i dont know.... if i were you id give it a try, start out with 15-20 mins mine didnt like it all that much to start out with but now he loves his crate its a safe place for him and it sounds like your dog has had alot of change and new homes too. you have to make it comfortable for them give him a good chew toy and a comfortable blanket and hope it works. im not a professional but if i were you id give it a try. i feel for you!