I have a new problem and not sure if its related to TOS and/or RSI....

My neck feels SUPER weak. Alarmingly. Its at the top of the neck, where it meets my skull. Feels like its both strained and tired. Almost like the days (I believe it was 3 days total) when I was eleven and wanted to be heavy metal and I would headbang . Except the aftermath of headbanging had neck pain. This is just tension. And almost nothing I do feels good, including laying down- unless I'm doing traction.

Does this sound like anything you've experienced? This sensation is new to me. My problems have always been from around the clavicle- down. Trying to determine if I should go see my RSI doctor.... (things are complicated as I am P&S and my WC is challenging that I am permanently disabled. Currently waiting to see if I get to even continue seeing him at their expense- etc, etc.)
I hope this gets better cos its worse than pain.
p.s. fun fact- this weakness showed up suspiciously right after my Functional Capacity Eval