I’d recommend a knee sleeve, especially if you are feeling a little weak/unstable yet. You can pick up one cheap at a drug store or a Target/Wal-mart.
In my experience when I’ve been short on money, I’ve found providers are usually pretty good with working w/ patients on payment plans. Sometimes it takes a lot of calling, and simply telling them “I will pay you this much each month, and it gets paid off when it gets paid off” – Hopefully you can decrease your appointment frequency (if you are comfortable w/ that) so the bills don’t stack up so fast.
Have you checked with your OS at all to see if he could get more appts approved through your insurance? I would think he could if it is “medically necessary”