Complete numbness in fingers and both sides of hand. is this carpal tunnel syndrome, if not what is it?

See below:: This could be carpal t syndrome plus cubital ts where the other nerve to the hand (ulnar) gets trapped at the elbow; and more rarely ulnar can get trapped at the wrist, on the little finger side. Also nerves getting pinched in the neck can also cause a similar picture.

By both sides of the: Hand f you mean the palm and the dorsum or top of the hand and all the fingers this is what is commonly knownin the hand as a glove ( in the foot--stocking) distribution and is not typically related to cts. However multiple nerve involvement or a more proximal source such as the neck or brachial plexus may have tingling that encompasses these areas as well