--if you think your neuropathy was caused by imbibing alcohol, it's not idiopathic.

And it may be hard to parse out the nerve damage caused directly by alcohol as opposed to that caused by the nutritional deficiencies that heavy user of alcohol often have, meaning that low levels of various vitamins (notably the B-complex vitamins) may have contributed to it.

Start with the info at the Washington University Neuromuscular database:

Toxic neuropathies