@cm0308 I have 3 and I am 34m.
I am stuck in a foreign country because their mother is a violent lunatic who won't let us leave, she is living in the house I paid for in cash. She pays no rent and no mortgage, she doesn't pay child support. In the last year I'd estimate 50 horrid experiences of her engaging in atrocious acts towards myself and the kids. No one gives a shit because she is female and a national of this country and men are second class citizens, while foreigners are dirt here.
I do not speak the language, I do not know anyone, I have no friends and family here and I will be chained to this place for 11 years - I cannot even take my kids to see family back home as we don't have her permission (see Hague convention on international child abduction). I work nights from home and get 4 hours sleep a day. I see the police, social services and courts on a very regular basis which is draining to say the least (emotionally and financially).
It's tough.
But you can do it. Your kids love you, even if their other parent is a piece of shit. It isn't your fault, and you have two options - hate yourself and the world for it and complain that it isn't fair which will change absolutely nothing and drive you to despair, or give yourself a good kick up the ass, stand up tall and stride into the future one day at a time.
Remember - self-care is vital, treat yourself to something small every day because you've definitely earned it. A hot meal, a face mask, a movie or reading a book, some behavioural management classes to help you with the kids because I know it's a handful with multiple kids by yourself.
Another thing to remember - one day at a time it gets easier, the kids get older, they can help with chores (age appropriate), and cuddles - lots of cuddles and affection will get you through but don't become emotionally dependent and a burden on them, don't complain to them - they are kids and to them, you are a god and mom and you're their rock, not the other way around.
Don't be hard on yourself, seize the day instead, even doing something small to better your environment will make you feel better than you did earlier that day. Have a bubble bath with some candles, stick some cucumber on your eyes and relax for 20 minutes.
You can do it. We believe in you. You've got this, and remember - when it gets really hard and tiring, you're the one that is there, you're the one that is putting the work in, when the kids are grown, they will remember and love you for it, for always being the one they could depend on, even if there was no one else that you could depend on yourself.