--not just numbness in the extremities causing a loss of bodily feedback.

It can also come from problems in the sinuses, especially conditons that affect the semicircular canals/vestibular system in the inner ear; problems in the cerebellum, the brain area that coordinates muscle movements, adn many other possibilities . . .

It's certainly possible that balance problems are resulting from conditons other than peripheral nerve damage, and some very thorough examination and testing might be needed to tease out what's contributing to it.