Ohio49 - The buzzing in your arm may be L'hermittes sign, but if you only have C5 palsy, it is probably something else. When your nerves start to grow back, they do some very strange things (like buzzing and twitching). Hopefully, that is what's causing your buzzing.

Have you had an EMG done by a neurologist lately? An EMG can determine if the nerves are regenerating. This growth will show up as something called "growth potentials". The neuro will be able to tell if the amount of regrowth could be the cause of the buzzing. They should also do a MRI to see if there are other issues like L'hermittes.

Are you using a nerve stimulator? It can also help with things like pain, buzzing and twitching.