The following article suggests that "tricyclic antidepressants might deplete the body of coenzyme Q 10 (CoQ 10)." Perhaps a mechanism by which amitriptyline could cause neuropathy. BTW I have been taking it for a few years, mainly 25 mg/day, and it helps with my pain level. If it were slowly making it worse, I might never know. You can find alternatives, there are many drugs used to relieve painful neuropathy. It seems one of the premier ones is gabapentin (Neurontin).

I can't post links yet, so go to **
and search for "Tricyclic Antidepressants"

"Coenzyme Q10(CoQ10)

Preliminary evidence suggests that tricyclic antidepressants might deplete the body of coenzyme Q 10 (CoQ 10), a substance that appears to be important for normal heart function.1,2 Based on this observation, it has been suggested (but not proved) that CoQ 10 supplementation might help prevent the heart-related side effects that can occur with the use of tricyclic antidepressants."

Good luck
BasicPoke