You might have poor circulation, I wouldn't worry about your nose being cold as there is no reason for blood to flow through it - it has no muscles at the tip. Your fingers being cold could be a sign of poor circulation which is nothing to necessarily worry about unless you have a history of blood pressure abnormalities in your family. A simple blood pressure test should confirm if you have reason to be confirmed. Your hands are naturally prone to getting cold, it is winter so don't be too paranoid if they remain cold and you can't explain why, a pair of gloves and a balaclava will fix both of your problems.