I'm losing it.

I'm feeling really overwhelmed and unsure of what to do. Before my injury, I was going to the gym 5-6 days a week and had lost 150 pounds and gained a lot of muscle. I still have about 60-70 more lbs to lose. The thought of losing all my progress is terrifying. The surgeon and nurse both told me not to rehab or go to the gym at all right now but I keep reading how important prehab is, and it's making me feel weak and stuck. I'm also dealing with all this through work comp, and my claim has been transferred around multiple times, which is taking longer than expected despite being told I need this surgery urgently (within 2-3 weeks) because of there being a bucket handle meniscus tear on top of the fully torn ACL. It's hard for me to just sit around all day when I've been so active. I know it's important to not worsen my injury, but I can't help feeling like I should be doing something to stay active, even if it's just a little bit. I've called the doctor's office a couple of times and left a message asking if there's anything I can do in the meantime, but I haven't gotten a call back yet. That's why I'm here. Has anyone gone through something similar?? What should I do