--people with long histories of alcohol use often suffer from malnutrition--alcohol leaches B-vitamins and certain minerals from the body, in particular--and that is an avenue that should be explored, even given that you are now supplementing. (There's still some controversy as to whether "alcoholic neuropathy" comes directly from the action of alcohol on nerves or from the nutrient deficiencies that result--perhaps both.)

I notice that you didn't mention how much of each supplement you were taking--that would be useful.

That 490 B-12 reading was a red flag, from my perspective. That's too low, no matter what the standard ranges say. Most of us like our B-12 levels nearer to 4 digits; Mrs. D's B-12 thread has a number of examples of papers showing symptoms of deficiency in people at that level or even higher, and suggest methylomaic acid (MMA) and homocysteine testing as being better indicators of B12 deficiency. And you may be suffering from other low levels as well (as you mention, this is not one of the things doctors think to test for immediately).

It would seem that you would need a more comprehensive work-up with a lot of other testing for autoimmune markers and the like, just to rule out some sources of acute/sub-acute neuropathy symptoms. And yes, such symptoms can be mimicked by brain/spinal cord problems, such as seizures or nerve root compromise.

And, at the risk of sounding simple, have you had any testing beyond a fasting blood sugar for diabetes/impaired glucose tolerance/insulin resistance (certainly common for your age/demographic)? Neuropathy symptoms are increasingly found in people with impaired glucose regulation well before frank diabetes can be diagnosed.