Hi Lucifer, yes I had exactly what you just described. I had permanent pain in my left that would get worse after any kind of loud exposure. Gabapentin somehow reduced all these symptoms and I can say that I am now 99% hyperacusis and noxacusis free.
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The only pain that remains is inside the ear if I put anything in contact with the ear canal (eg: ear plugs).
I stopped Gabapentin last September and the situation has been unchanged.
The pain was always there, with or without exposure to sound. Gabapentin seemed to help with the stabbing and aching & burning pain.