You need a plan....
Here you go......
First of all, find yourself a church, a good strong church where they have a children's ministry, sunday school and activities... such as Baptist, Methodist, Catholic.... what ever you demonination is....
Join and take your children every sunday to sunday school so that they can learn respect and what God expects of children.
While they are in thier children's sunday school class, you should be in an adult class.
Next.....
Exercise... run, or briskly walk to get out that agression while listening to some good insprirational music.
Next.....
Sell the house....
Take some of the money and place it in an interest bearing account.
Take the remainder and either buy and smaller more affordable house or move in to an affordable rental... so that finances is not an issue.
Next...
Stop comparing yourself to your ex....
Have a sit down discussion time talk with your mouthy children separately and tell them the rules, what is acceptable and what is not in terms of talking back...
No yelling, as that indicates to them that you lost your power.... no crying in front of them... save that for the privacy of your bedroom.
Show happiness and strength... so they will feel secure... They feel insecure with you because they see you falling apart....
PULL IT TOGETHER SISTER.... you are almost there.
It's ok, that you don't have a car...... BUT.... when you sell the house and create money for yourself..... you can either hire a driver or make an arrangement witht he local taxi cab driver... You see, taxi cabs make little money, BUT if they know you are going to use them on such and such date every such and such hour or so... they will cut you a break.... It's nice acutally....
When your children get out of line, put them on time out, take away their favorite toys or tv time..., learn how to give them that LOOK.....
the LOOK is for example, when I was a kid, my mother was a yeller at home, but such a lady and well put together woman in public..... so when we were out and about, if I did something wrong, she would just LOOK at me a certain way and I would stop and behave. That LOOK told me that if I did not stop NOW there would be hell to pay.... although, there was never HELL to pay, because I did not push her to that point, once I saw that LOOK.
So when I grew up and had a kid and she was mishaving at home or in public, I gave her that LOOK and she stopped... never had to threaten her, just the LOOK did something.... that all the yelling could never do.....
Kids know how far they can push you, so you have to be the adult, shift gears on them and handle your business....
let me know how it goes...
Sincerely