It sounds like you very much need to start building a support network focused on child care. How about making a list of resources you have and resources you need?

- Family
- Friends
- Mother's groups (trade with someone who works days or weekends?)
- Live-in child care? An au-pair?
- Professional child care options

Just tossing out some ideas...

M 16 yrs, WH62, P54
3 adult blended kids
EA 11/13, BD1 6/14
PA fall 14, BD2 2/15
Piecing 2015, BD3 12/15
Separated 4/16
WH moved OW in 5/16
Divorced 6/15/17