Wow, I thought being down with one broken leg was bad. Did a compound fracture in 2003. The only real advice I can offer is that your recovery is going to take more time than you would like. Just doing normal stuff like mowing the lawn after I got out of my cast was a major effort. It took me almost a year until I felt fully healed. If your in a structured rehab, do what they tell you and do the exercises.

There is one exercise that I cooked up while recovering which helped build my leg strength. Using one of those soft 5 lb balls(about 8 inch dia) hold it with between your ankles and raise your legs. Either seated or lying on your back. Still do this when using the total gym once or twice a week. It is much harder than it sounds. Good luck.