Dear K.,
I was on bedrest for 5 weeks, so I feel your pain! I didn't have an older child, though, so my situation was easier than yours. What I decided I had to do was teach myself a skill. I needed something with goals I could complete. My original plan -- write that novel I've always wanted to write -- just wasn't going to happen; I was too restless and anxious. I settled for a much more modest goal -- teaching myself calligraphy -- and by the end I'd gotten pretty good. I even hand-addressed all my brother's wedding invitations. If there's anything you've ever wanted to make with your hands, this is a great time to do it. It really focuses your mind and changes your relationship with time.
With your daughter, you might just look for a long-term absorbing crafts project you can do together, on your bed. Can you, say, build, paint, and populate a big fairy princess castle or something? You might wind up with paint stains on the bed, but under the circumstances, it might be worth it. I also recommend reaching out to friends, family, anyone else in your network, who can help out with shopping, childcare, etc., to lighten your husband's load a bit.
Finally, as others have said, I really missed my bedrest when it was over. Now that I have an active preschooler, a part-time job, and an education to pursue, I keep wishing someone would come along and confine me to my bed for a couple of months. That's probably not what you want to hear now, but you might try to think of this as a time to soak up all the rest that you're not going to get later.
Hope this helps,
Mira