I have two kids and it has been a ride. I would advise to take care of yourself by making sure to allot time for you, your treatment (meds and therapy or whatever you require)

Honestly, sometimes I cope by making it to bedtime. I know I will have time to mope after than. Before that, you just have to try and muster as much enthusiasm as possible. Set them up with projects to do and not park them in front of the TV for extended periods of time. Save that for an SOS, or a reward for good behavior and getting chores done.