Might be an idea to keep a record of how you feel; you might then, even though you still feel awful, be aware [although you have mentioned it]that things are slowly improving. I know it's nothing like having a car crash but I had a fall off a stile when out walking one day; for ages afterwards when I got up from lying down I felt dizzy and I had to actually hold my head in place. At the time I thought I'd never get better because it seemed to take such a long time.
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WORD ASSOCIATION -27 (June 26)

wouldn't that be muscular? I wonder if you are still suffering from the shock of the accident happening. Definitely see your doc, I would say.