Dear Carol Ann,
I suggest you work with the Healthful Sleep and the first 3 self-calming exercises on the Panic Attack imagery, starting now, so you can get a jump on learning to settle yourself down at will before getting back into that driver's seat.
If you find you're having recurring, intrusive images or nightmares, involuntarily replaying the accident in your mind, you may want to use the Healing Trauma imagery, as well.
But chances are, this will subside of its own accord after a few months, and the result of your body still running adrenaline from the accident - that often takes a few months to settle down, as your body pendulates (hopefully in smaller and smaller swings) between adrenergized alarm states and detached numbness, driven by endogenous opioids. So I'd wait on that and first see if the other relaxation imagery expedites that settling.
Massage therapy might also be very useful here.
I hope this helps. My best wishes for a smooth and uneventful return to normalcy.
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