Ive been to every reptile vet in my area and none of them have ever been any help for anything. The one I go to now is a human society loon who believes keeping reptiles is inhumane or something but, has no problem taking my money and trying to guilt me into every conceivable treatment. That being said it sounds like your boa has a broken jaw. Reptiles do not recover very quickly from injuries like that and I cant imagine any treatment other then an experimental surgery that has probably never been done before. If Im right about the broken jaw it will be a long road to recovery and skipping a meal or two isnt going to do your snake any favors. Try a small prey item first and see how it goes. keep us posted.
Jason