I am very sorry for the OP's entire situation ~ it would be a nightmare any time, but especially around the holidays. And, I know if I'd just gotten that diagnosis, I'd be more than a little prone to freaking out over any/everything, too ~ especially at the MSC who ruined everything that had been set up, by their non (or late) payment. Including a few four-letter words, more than likely.
Please do contact a patient advocate... I heartily concur with everything said about them by the others.
Also, please let us know how things go for you.
I don't know how else to possibly try to explain it, but (thank God!) we are NOT employees of the MSC's. Not employees in any way, shape, or form. We are independent contractors, which is an *entirely* different thing. Any legal or governmental entity would NOT support nor recognize us as employees. It's like we're each running our own small business ~ consisting of us! If we were employees, as Lisa said, we'd have to report for work at certain hours and take each and every job they send our way regardless of pay. Plus a ton of other little things that differentiate IC's vs. employees. And, of course, if we were employees, we wouldn't get paid by the job/assignment. Just Google "employee vs independent contractor" for more intricate explanations.
And yes, you can negotiate all kind of things with the MSC! Which I hadn't thought of, either, though, until reading about how to do it on this forum.
Anyway, the best of luck & tons of positivity to you in your healing.
And to plmccut ~ how f'ing awesome is that news for you! : )
Practitioner of the Nerdly Arts.