I've only just started to get energy back ... a few times I thought I was back to normal, but it only lasted 1/2 day or so.
My son has *thankfully* gotten pretty good at playing on his own. We've watched way too much TV, but he's learning about skiing & other winter sports(we mostly watch Universal Sports which is the Olympic type sports channel). DH has been great about taking DS to ski lessons on the weekend, which means they are gone for 6 hours or so, and I can rest.
If there is anyone at all you can get to help you out, use them! If you have friends who like to cook -- ask them to make double of their dinners for a few nights, and bring you a batch of food for your freezer -- then even if you don't feel like eating you can feed your family the food you can't stand to cook. I trade research for food all the time -- I like to research, I have time to do it, and my friends mostly either hate it, or don't have time. So I get baking in trade for research services or interior design (I had a business, closed it recently b/c of the economy, but still do work for friends in a bartering sort of deal). If there is something you do have the energy or interest in -- trade with friends! If not, tell them them you'll return the favour in the fall & bring them some great soups or chili or something then.
If you have a YMCA near you, I know our local one has great kids programs every morning for 90 min, DS doesn't go now, b/c I have daycare kiddos here to watch & cant' take him, but he will be going in fall, right now he only goes Saturday mornings. It's drop in program no registration, and his monthly membership is under 30$ - DH also takes him to swim lessons as part of that membership. If you've got access to anything like that use it! Even if all you do is drop him at the program and get a cup of tea and sit in the waiting area the whole time, it's 90 min you're not in charge & can take a break. (better if you can go home & rest!).
Also, around here, a lot of the indoor playgrounds let really little kids in free with a older paying child, so if you have a friend and the ages work out right, you can let them loose in there and sit and watch. First thing in the morning, we can usually go for 1-2 hours and it's no busy or full at all. That helps make up for the 'can't run in the park' energy they still have even if the snow is as deep as they are tall out there. I know that if I can let DS (and the day care kids) get their energy used on something, the day goes much better. An indoor climber, or small indoor trampoline can help with that too! Something he can do while you watch & don't have to actually do anything, b/c you dn't have the spare energy that he has.