Poor guy! Hopefully he didn't hurt himself. Those metal wire crates are actually pretty flimsy...not too hard to escape for a panicked or determined dog. Also, the sharp edges left after they rip it apart could really injure your dog. You could try Impact Crates, they are super heavy duty...pretty expensive, but if you can prevent your home from being destroyed, it's probably worth it! There are several cheaper alternatives, but I'm not sure how strong they are. Just search "heavy duty" or "escape proof" dog crate, and read some reviews. Heavy duty crates look more like this:
It would also be a good idea to work with a veterinary behaviorist to see if you can improve your dog's SA, there are training methods and certain medications that can be a big help while you're working through it. A good, hard exercise before you have to leave the house might help, and it also might help to give a frozen kong with something really yummy inside (although many dogs won't eat them when left alone). Maybe someone else knows a little more about the training methods you could try...I've personally not dealt with owning a dog with SA, but I'm sure its not fun. Good luck to you and your pup.