You have received so much great advice here that I don't have too much more to add.
Having distance and time away from the WAS is sooo good for detachment. Trust me, you will learn to cherish it, even if it s@cks right now. It sounds like you are crazy busy (a good thing) with work and being a single parent, but try to carve out time for yourself on the days that you don't have the kids. Proactively plan activities that will get you out of the house and with other people, plan to meet with friends, or do meetups, or whatever it is, but find social outlets. For me, it is also helpful to carve out time to sit by myself and meditate, or take a walk around the neighborhood in the early morning when no one is out. Really trying to find that stillness of mind and focus on the present moment and letting go of the stresses, worries, concerns about everyday life as well as our sitches.
Best of luck in everything. You are in my thoughts and I know that you will come through this stronger than ever.
W 34 Me 42 Married 7 years together 8 0 kids 1 beloved dog BD 4/6/2018 I moved out 4/7/2018 I moved back in alone 8/05/2018 I file 3/06/2019 D official 5/7/2019