I've always had good experiences with USAA. That said, right now say as little as possible to the adjuster(s), especially with regard to your physical condition. Let a doctors report(s) do that. Let the police report, if one exists, describe the accident. Not you. Remember, everything you say (to anyone) can and WILL be used against you and may jeopardize your case. "I don't recall right now I'm in too much pain." is a good response. Don't hesitate to consult with an attorney at your earliest convenience. You need not discuss the fact that you did/did not with anyone . . . . yet. It sounds like there are some major damages. You are playing a game with professionals, don't think you are smarter than they are. They do this everyday for a living, unfortunately you have to for a while. BTDT!
Chum lee