The neck pain
which is radiating down your arm is suggestive of compression of nerves in your neck region. The tingling sensation
near ear and jaw area could also be related to nerve compression. However you have developed these things over a relatively short period of time. Shaking of arms and more so of legs is an real concern. You should get yourself evaluated by a neurologist
as soon as possible. MRI
scan of the neck region will be required.