Our expert says:
It sounds as though the sciatic nerve is getting trapped somewhere. The good news is that if it were from the spine it would be localised to a specific area, but because it is not I would say that piriformis - a small bum muscle is more than likely catching.
Two things to try: Sit in a chair - cross your right leg over the left (the way guys do) and bend forwards- this should give you a good releasing stretch. Do this three times holding for ten seconds at a time, with this you can also look for a very sensitive point on your pubic bone and release here too.
Second try rubbing your left jaw muscle - your whiplash may be triggering the back symptoms.
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