--after a massage/manipulation does not seem like a spread of systemic peripheral neuropathy to me; it sounds like something additional, such as a sudden disc herniation or foraminal narrowing due to the mechanical forces. In other words, it sounds spinal and traumatic.

So,I would agree that imaging of the neck and probably also the thoracic/lumbar spine would be a good idea. (It's probably a good idea anyway in cases of wide-ranging neurologic symptoms, as the symptoms caused by spinal nerve impingement and those caused by more system conditions that affect nerves can be exactly the same.)