There is not much advice that hasn't been given already. I agree you need to keep FIGHTING for your son, and not give up. Your son is so lucky to have a mom like you. Let him know how much you love him and how it wasn't his fault and this will not define him. I also agree that getting him therapy right away is the best thing for him - it can really help avoid a lot of the long term effects of this trauma.

Best of luck. You and your son are in my thoughts and prayers.