First of all you poor poor woman, it sounds horrendous in your life at the minute.
Secondly its not forever, but it damn sure feels like it right now. You are doing your best, its not easy at all, fuck them who want to judge you, tell em to have a child each and come back with a better attitude, not the kids your parents and inlaws.
Have the kids got a proper bedtime? Whatever that may be? 6.30/7/7.30 pm
When they are in bed you need to mind you, dinner for you can be a plate of veggies, microwave meal, chopper or chinese followed by a bloody great hunk or cake or chocolate and an hour with your feet up on the sofa watching shite on tv,
Then and only then do you throw a wash on, tidy up a bit and head for a nice shower or bath and bed. Set your cleaning to 30 or 60 minutes, whats done is done, feck the rest.
Tell hubby he must do 30 - 60 mins also that way there is loads done and no one ever died from an imperfect house. If he refuses tell him his balls are getting chopped off next time he closes his eyes. ( joking hmmm he can decide 0n that)
Daily - put a good bolt on all the doors you don't want the tiny terror escaping from, including the kitchen door and double bolt that kitchen door, so when you say he cant leave the room, he cant leave the damn room. Food at table or not at all.
Get them into the garden - rain, hail, sleet or snow, just wrap em up and let them get it all out of their system.
Nursery - can he do more days or hours during the week
Local teens - any to come along with you to help you out at the park, teens love money, pay em a fiver for an hour and get them to watch the older child, you watch satans love child ( I am joking lol)
Reins - he can call childline for all I care - reins on or we stand here until you give in buddy
Child seat - cable tie the wee treasure in if needs be, cable ties are cheap n cheerful, there are non escape harnesses, or just be horrible mammy and stop the car. Assuming the child locks and window clocks are activated, pull over to the side of the road and read your kindle, throw in earphones and drown his screams out.
Failing that a quick visit from the local policeman might work ( a stern talking to from a copper in uniform lol), I know he is only 2, but he aint stupid. Policeman telling him he has to wear that harness might just work
Try book yourself in for a treat on a Saturday, even an internet cafe where you spend 3 hours in peace, a library book and a coffee, a massage, pedicure, anything that's you time. Hubby can do the same its not a competition, but do try each week just to have some YOU time, a lie on, one day, he gets other weekend day.
Its not forever this time, but it feels like it. I was reading your post thinking if only I could help you out, you just sound overwhelmed and in need of a hug and a second set of hands.