Open back or front door (or just a window) then and just sit outside, breath deeply, calm your mind, focus on the warmth of the sun and just think nice calm thoughts for 10 minutes. Switch off. After 10 minutes, make a cup of tea, sit down and write everything down that you have to do. Then divide it up between stuff you absolutely have to do today, stuff you should do today (but can wait until tomorrow) and stuff that can wait for longer. Plan something nice to do when DS wakes up. Then put today's tasks in any sort of order and set out to achieve them one at a time, as slowly as is required. Achieving any of them should be celebrated. Have another cup of tea/biscuit/big hug with DS/chat with friend/whatever else will make you happy. Then onto the next one...
I've had issues with anxiety and depression and at times when everything gets on top of you you just have to do things one step at a time and make sure that you have little things to look forward to as you go. Don't set too many targets for yourself if you are having a bad day, they just give you excuses to beat yourself up more.