Hi DAG
Firstly, you ain't going nuts & secondly you probably do indeed have CTS. Is it mostly your thumb, index, middle & ring fingers which are affected? That indicates a problem with the median nerve - the one involved in CTS. If it's mainly your ring & pinky fingers, that's your ulnar nerve. That one often gets trapped at the elbow causing Cubital Tunnel Syndrome.
These NCV/EMG tests are not very accurate. A study done in Leeds UK showed that something like 25% of people tested who did NOT have symptoms of CTS showed a positive result & many of those who DID obviously have CTS came up negative.
I had CTS surgery done without having these tests done beforehand. The surgery worked fine for me.
What I'd suggest is that you read as much as you possibly can on the subject then fight to get the treatment that you want. I'm in the UK so don't know too much about WC I'm afraid.
Best wishes
Lidia