I agree up to a point, it sounds more like a compression type injury than a proper whiplash though. There I’d much more to treatment than clicking though. a chap I saw in the simmer had an off in the alps, broken neck, ribs collapsed lung etc, no clicking/manipulation but he responded extremely well to massage and gentle inhibition and mobilisation with exercise advice.
Edit: too slow typing on phone! In light of coccyx injury then disregard what I just typed. My earlier advice stands, look for a local recommendation.