I did the whole higher rate tax payer to living in poverty dive when my DC were 1 and 3. 3 year old severely disabled and XH walked out. I went from driving a nice car to not being able to get an old car out the garage because I couldn't pay the bill.
Mumsnet was brilliant, saved my sanity. It helps to talk it through.
The situation will change but its not changing in a rush so you need to be very, very honest with yourself and write down your hierachy of needs. Income and all outgoings. Look at the annual ones too so they don't catch you out.
Its scary. Its also amazing the things we start to think of as essential that when it comes to the crunch aren't. This isn't forever, this is like having a financial detox and then when you've hit firm ground starting to enjoy having choices again.
The biggest costs house, council tax, fuel - how rigid are these? Is your landlord a longterm one, would they rather keep you as a good tenant and consider a rent adjustment, in the medium term do you need that house in that location of that size, could your DC share and rent out a room (landlord dependant, I did a bit of Monday- Friday renting of a room for a bit so the house was ours at the weekend - grim but temporary), could you downsize to need one less room. As others have said is that council tax repayment too steep if you're honest they're usually really good?
Heating - costs weren't what they are now but I turned off my central heating when my DC were little and used a wood fire in one room - I had lots of trees I could burn, a luxury on reflection. I used to call the children my little icycles as they'd creep into bed with me as a giant hot water bottle. Hot water bottles are fab things, blankets on sofa, double up on socks. When the toilet cystern freezes (as mine used to) its probably taking things a bit far.
Food shopping is another big expense. I had a habit of filling my trolley in a certain way. I started pricing my meals, looking at the cost per plate. Some really surprised me - lots of cheap ingredients can add up to be the same price as what I'd consider a posh tea. Some meals I enjoyed were half the price of others. All the bits add up. I also portion controlled. Even partial portions can be frozen and then a pot luck hot reheated buffet of many different flavours saves cooking and the cost of a meal.
If you can work out what your true essential basics are and get that below your income, each pound you have beyond that is a choice - choices are luxury.
My elder DC (I'm a mum of three) are now 19 and about to be17. They're financially very savy. Their early financial lessons have taught them well. Eldest even works in financial services. I got them involved trying to turn it into a game (ever the optimist at trying to make sunshine), empower them to be part of the choice. Special treat money - an icecream at McDonalds or a bag of 10 donuts that would last us a few days. It doesn't matter that someone elses treat is a week at Disney, choice is power. My about to be 17 year old still wants the special choose your own bits birthday tea of beige buffet we had and made a big treat of when he was pre-primary. Dont beat yourself up unnecessarily over what you can get for your DC, its surprising as young adults the things that are their special memories.
Mine learnt to look after their posessions and I'd keep back boxes and packaging and we'd sell on. They could then be part of the choice on what to get next. eBay was our lifeblood - I now run a successful business on the platform (and elsewhere) off the back of my early trading keeping the wolf from the door.
This wont be forever but don't drown. Sit yourself down and start a plan and lean on others when it gets a bit much.