CONUNDRUM. HELP!

I have a weird kind of cyst in my left leg. It's so painful that I can't walk. I'm getting crutches today, but the doc office says I either rest or it won't go away. Then comes surgery.

Yuck.

So ... how can I lose weight without moving? Except for caring for the livestock and driving to therapy appointments, I'm not allowed to get out of bed.  So how on earth can I lose weight? Are there exercises I can do in bed? Is there some diet plan I can do without hobbling to the refrigerator or standing to cook?

Help!