Ok, well the other day we had planned a private lesson with a trainer who we were told was excellent, and I wanted to try some obedience with Rex, well the class didn't go to well Rex was scared to death of him... He even growled at him, and when he asked me if he normally growled at home, I said no and he was surprised. Rex loves people but he was scared to death of that trainer and the trainer just kept choking him. Now rex is used to a choke chain but¸never used like that:( I feel super bad because now he sticks to me and my mom and dad like crazy and he gets so scared easily). To make it worse the other night my parents were arguing, (he came down like always) to find me and started crying at the bathroom door, then he went to lay under my bed and got stuck and cried, and cried it took us quite a while to get him out. And yesterday we took him to my grandparents house, and he's supposed to stay out in there porch, and my normally happy go lucky I love life husky, was scared to death, he would keep coming in the kitchen and hiding under the table. I did put my sweater for him to lay on and thankfully that quieted him down a bit. Everyone is noticing the difference in his behaviour, what can I do so he goes back to his old self?

First off I'd change trainers. That trainer's methods may work well with other dogs but definitely not yours. Leaving your sweater with him was a good idea. I think socializing your dog as much as possible will help him recover. The more good interaction he has with people and other dogs the faster he will get over it. I'm a horse trainer not a dog trainer but I do know that what works well with 9 out of 10 horse may be completely wrong for the 10th one and trainers need to recognize this and modify or re-evaluate their methods when the need arises.