The presenting symptom of my PN, years ago, was a sense of sweating in my feet when wearing shoes, especially without socks. I even went so far as to buy cornstarch for it. Eventually, I discovered (by actually touching my feet, duh) that I wasn't sweating at all. It was one of the symptoms of PN.
Have you touched the body part that feels like it's sweating? If it really is wet, then that's your clue.