Hi Ada,
I'm so sorry about your car accident. As the others have said, it is VERY IMPORTANT that you monitor yourself for injuries. Often time it can take days or even weeks for boo boos to become obvious. Shock and swelling can hide a lot of damage.
As an MVA survivor, I am terribly concerned about how hard you struck your head. I can't imagine taking a blow of that force without sustaining some sort of brain injury. I don't mean to scare you, but these things are often overlooked by doctors and rarely show up on standard MRIs or CAT scans.
How are you feeling cognitively? Are you foggy? Can you count backwards by threes? Can you close your eyes and touch your nose. Can you walk heel to toe? Do you have headache? Is light and/or sound bothering you? Are you dizzy? Do you have an upset stomach? How is your speech? (Did you just call your dog a dumptruck?) Are you unusually angry, depressed or irritable? Are your pupils equal and reactive?
My last bit of advice is to get a good lawyer ASAP. Those scum ball insurance company adjuster will be at your house in no time. Even when you're not at fault for an accident, it's seldom wise to deal with them on your own. SIGN NOTHING!!!!!
Take Care