I know some people's partners have jobs which take them away a lot BUT if you have a partner, even if dont have physical support, you have support
my soon-to-be ex was away a lot during the week & so yes, I did most of the childcare by myself BUT he was on the end of a phone supporting me (until he started his affair but thats another matter)
when u r a single parent, its all down to u and it is tiring. You cant just have 10 mins to urself or let someone else play with the kids or take time off work - you wake up every morning knowing its u or noone
sorry had bad week