Karen, IMHO this does not sound like CMT to me. For example, the fact that your knee comes back from being numb when you rub it. And your arms and legs are weak when you first get up and then they are O.K. enough. If it were CMT they would not come back.

There is Hereditary Liability with Liability to Pressure Palsies (HNPP) which symptoms can return to normal or near normal. Eventually that also changes. Here is the site with lots of information.

http://www.hnpp.org/

HNPP is the opposite of CMT1A.

Doesn't hurt to check your family history anyway to see if anyone there is experiencing any kind of symptoms. A good neurologist who knows CMT could perhaps help you if you think it's that. Hope you find the answer.