I'm so, so sorry about your accident. I was hit by a truck in May and my bike ended up under the rear tire of the truck, too. Take very good care of yourself and don't try to push it too hard too soon. And if things aren't feeling right, go see your doctor immediately. I waited a long time before doing that and found out that I had problems that hadn't been found the night of the accident.
Take care and I hope you start feeling better soon,
Susie
"It never gets easier, you just go faster." -- Greg LeMond