M.L.
This is a wonderful time to call in favors from friends, if you can do it. You need somebody to help with the deep cleaning, and *definitely* some people to help with the co-op, both because of your current health and the fact that you'll be out of the country for a while. You'll have to say this is something you can't handle by yourself right now. I'd be glad to come over and help, but I'm a little too far away.
Also, can you find a reliable high-school girl who can come a couple of hours a week and hit some of the high points of your regular housework? That will take a little more burden off your shoulders until you feel better (and give a young girl some practice).
Meanwhile, you're getting overwhelmed. Make yourself get out in the fresh air at least once a day, or twice a day if you can do it. Walk - or just sit - but be outdoors. Take your children with you - it will be good for them, too. Instead of watching television, read books to your children. (I don't know how old your children are, actually). That's something you can do even if you can't sit up - which I know from personal experience. Put on some music and encourage them to dance, or to draw pictures of what they hear. This could be a great time for them to learn to use their imaginations to keep themselves occupied.
I'm another of those people who wakes up in the middle of the night when stressful things are happening. I don't often actually get up (I've done it once in a great while), but I'll pray, and memorize poetry, and do other positive mental things while I'm lying there awake. I consider that when my mind that goes around in circles it's an enemy of my health.
You are NOT worthless. Your family doesn't think your are, and neither do your in-laws (I hope). Your body and your mind are just in cahoots against your feelings right now. Hang in there, and your feelings will come round.
Don't worry about a bigger house. You don't know that it *won't* happen - you only know that you need the money for this emergency instead. You may be surprised what will happen in a few months or a few years.
I'm praying for your family members in Ireland.