1. Xray to verify lead placement
2. Any movement, doc will know what to do
3. Any ID on the large dog, it's owners are liable for every cent of your fall, injury, possible surgery to relocate the leads if they moved due to the trauma of the attack.
4. Persuade Doc to order Xray to verify what is amiss
5. Get the needed care, documenting absolutely everything.
6. The owners of the large dog which attacked you, once found, become of great interest to your lawyer for their vicarious liability pertinent to the damage their dog on the loose or under their "control" if they were walking it therefore allowed to befall you.
7. Fix your personal needs with great documentation.
8. Visit your lawyer for the "what next" appropriate moves to take,
The avenging angel,
Mark56