Honestly, I'd work on one room for 15 minutes to a half hour and throw in a load of laundry. Then as a reward, I'd plop myself down with a cup of something wonderful and a snack to read or rest a while. When I can't get out or away having a comfy, clean spot where I can put my feet up helps me re-energize a bit. Chocolate is always welcome. Rinse and repeat.
I know your hubby is gone and the likely hood of finding a good sitter isn't always doable. Don't go cleaning crazy getting ready for the cleaning lady either. Tidy and make a good list for her if you don't have one. I've been know to hire a teen to keep the kids watched and go wild cleaning. Now that mine are older they help, and I've been know to pay well for pitching in.
Get the laundry out of sight and just do it a load or two at a time. It's never completely done anyway. You know, people just keep making more. Sometimes making a list and checking it off helps me see how much is getting done and provides a sense of accomplishment.
Eating well taking vitamins and the occasional cup caffeine has helped me through many a long spell. ( I also love having a book I love to read on hand for the longer days and getting out for a walk is always wonderful.)
Sending hugs and lots of virtual dark chocolate.:grouphug: