Cold Feet: Vascular disease or Neuropathy ?

I'm a 45-year-old male that's been a binge drinker for 25 years.  I used to drink 6-8 drinks 2 nights a week, now I drink 5-6 drinks maybe one night a week.

For the past 6+ years, I've had cold feet.  All day long at my desk job!

I've complained to my doctor 6-years-in-a-row at my annual physical every year, but he's never really been able to diagnose the cause of my cold feet, aside from eliminating a few things.

My doctor has run a bunch of blood tests etc on me, and doesn't think the cold feet problem stems from Diabetes or Hypothyroidism.  

And the symptons aren't at all right for Raynaud's disease. 

So I'm thinking it's either 1) Peripheral vascular disease, or 2) Peripheral neuropathy.  

Or, possibly some third condition that I haven't thought of.

Here's my own (possibly faulty) reasoning, to try to identify my condition as either vascular disease or peripheral neuropathy:

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PERIPHERAL VASCULAR DISEASE

Symptoms I have that seem (to me) to point to Vascular Disease:

•  If I go on a long walk, my feet are cold for the first 15 minutes, then feel amazing and warm (normal) until an hour after I stop walking.

• Standing or lying down helps somewhat; sitting in an office chair makes the foot coldness much worse.

• I'm probably 30 pounds overweight

Symptoms that don't seem like Vascular Disease:

• My doctor put blood pressure cuffs on my ankles (not sure the name of the test) and said blood flow to my feet is very strong and healthy.

• My feet feel warm to the touch.

• I've never been a smoker

• My feet "look" totally normal and healthy. (not blue or white)

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PERIPHERAL NEUROPATHY

Symptoms I have that seem (to me) to point to Neuropathy:

• The cold feet problem emerged 6 years ago when I started drinking more alcohol

• My nutrition is relatively poor; I don't eat a wide variety of food

Symptoms that don't seem like Neuropathy:

• My feet always feel amazing if I, say, submerge them into warm water.

• If I bundle my feet in socks or a blanket, my feet feel pretty comfortable.

• My doctor poked at my feet, and says that my sense of touch seems normal.

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OTHER RANDOM FACTS ABOUT ME:

• My hands and feet have always been clammy, perhaps undiagnosed hyperhydrosis.

• The only drug I take is finasteride (proscar).

• I drink a lot of coffee and caffeinated diet soda; approximatey 5 or 6 servings a day.  The start of this habit did coincide with the beginning of my cold feet.  But stopping caffeine for a week didn't perceptibly help my cold feet.

• I've started taking a multivitamin a few months ago, plus B vitamins, but there hasn't been noticeable improvement in my cold feet situation.

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So what do you folks think the cause of my cold feet is? 

Vascular disease?  Neuropathy?  Something else?

Any ideas on tests I could request?  Or how I could otherwise distinguish condition one from the other?

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