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It's hard to tell you over the internet what you are dealing with. Because he has already suffered some nerve damage, I would not rule this out as a cause.
Keep in mind, also, that stress can play a big part in hair loss.
Also, allergies are prevalent this time of the year. Many cats will lose hair because they are allergic to fleas, products, the environment.... A low allergy diet might be a good idea.
I hope this helps!
Let me know if you still have questions.
I suggest that you try a remedy that we have used with great success. We use an anti-anxiety "drug" (all natural) that is called homeopet (www.homeopet.com).
This helps to ease anxiety and to calm the cat.
If this does not help you, you should see your vet to rule out a medical cause for the anxiety.
I hope this helps more!