I'm getting disappointed

I'm manic depressive but between my doctor and I, it's well managed. My problems are twofold. I need to do some cardio to stay around my goal weight. Unfortunately, we tried a drug for 30 days that not only didn't do anything, I gained 35 lbs! While trying to work that off, I dropped my motorcycle on my ankle! Argh! Now I have three months or more of staying off the leg as much as possible while the bone/tendons heal. So I've been at this for over two months and lost a grand total of 4 lbs. I'm wondering if there's anyone out there who can give me some suggestions on how to make the most of this under the circumstances. Thanks all!