Hands always cold, middle finger left hand goes numb, what's wrong?

Could be Raynoud's : At your age, if you are not diabetic you could have Raunoud's Syndrome. This should be evaluated by a Rheumatologist because you could have an inflammatory problem like rheumatoid arthritis or Lupus.

Depending upon the: Distribution of the tingling it may mean one or more nerves are being compressed. The median nerve gives sensations of thumb index middle and part of the ring finger the ulnar nerve to the little and part of the ring finger and the radial nerve to the back of the wrist and hands on the thumb side sometimes combinations of these mean there is a more proximal sites such as the neck or the shoulder