thanks
for your input. While searching
for info on thyroid and circulation problems, I came across Raynaud's phenomenon, a sensitivity of the feet/hands to temperature changes that can affect the penis as a result.
My hands/nose don't go cold unless I'm in the cold, but my feet can go cold real quick and STAY cold during winter. I think this may be it.
Regarding possible diabetes, after looking that up, the only symptom that I do have is the cold feet.