Money For Orthognathic Surgery – How Does This Work?

Ok, I plan on receiving between $7,000 and 10,000 from a sold car.
The surgery I need costs between 20k-30k with orthodontics, I would like to start the surgery as soon as people…how might I speed things up?
As a impoverished college student, I don’t qualify for a loan because I don’t have an income , and I’m still waiting to see if the insurance will cover part of the surgery, though it is highly unlikely. I’m in a lot of pain and have difficulties sleeping and speaking, so this is not a vanity pursuit if any of you are curious.
Is there a legal way I can negotiate this with the surgeon? He seems very reasonable and understanding, but I don’t think he’ll waive 20 grande. Is there some sort of payment plan I can get on that doesn’t require an income?
any responses will be appreciated!!

How Do I Get My Money Back From My Old Dentist?

I’ve been received treatment with Invisalign for about 2 years now, but the treatment isn’t going well. My case is too complicated for this treatment (I just found out) and my dentist did it anyway. I saw a few orthodontists and they recommended going with regular braces, so I want to do that.
However, how do I get my money back? how much can I get back to apply toward the new treatment? How should I talk to my current dentist to get the money back?
Thank you,