Our great sympathy for both you and your dog! No real advice - except to see if you can find a good behaviorist to consult with. And take a good look at your dog - could be the symptoms are just a temporary reaction to the attack.
Maybe you can arrange to be able to bring your dog near (but not touching) the 2 Akitas and let your dog desensitize to them? I.E. behind a fence maybe?
What is the relationship with their owner?