Sharp pain on left thumb & wrist & spread to forearm which makes it feel very heavy and numb occur most night.is it carpal tunnel or nerve compression?

Could be CTS: It sounds like it could be carpal tunnel syndrome (cts)which is a type of nerve compression, but this will often affect other fingers rather than just the thumb. Is it on the lateral or outside of the thumb? It could be a tenosynovitis as well. If you look up a test called a finklestein test, you can check yourself and see if its that. If you have neck pain, it could also be a radiculitis.