with him going into detail why he hates me and he fantasises I die a slow and painful death
You need to start from here:
You and your children are alive.
And he has not "smacked" the children around yet.
You will get some great advice here.
Some of it from posters who have been where you are now who worked through the problems and are out the other side.
Take a deep breath.
Everything else will work its way out over time.
Sorry if I am too blunt but
for the big financial bit.
You are getting a divorce.
Even ignoring the DV the house property is gone its only a matter of the timing of when that happens.
You would have needed to qualify for a mortgage on your own and buy a home that you can afford.
Your takehome covers your bills and you have a track record of paying the mortgage so there ia no reason not to qualify for a new loan.
This has just pushed up the timing of that application.
It may sound stupid but you need to switch to think of it as a property you are renting off the mortgage company. You can pay the rent for Feb so the rest is a problem you can think about starting to solve at the end of the month.
You are always going to be better off getting rid of the financial tie between and your soon to be ex
You will not end up homeless you just may need to find a cheaper home.
As for your job you are already working flexable so go in and speak to your manager.
Explain that the DV happened today. You dont need to go into a detailed history of prior events if you do not want to.
Ask your manager what they can do to help. Again it may sound stupid but dont make any suggestion or offer of solutìons.
If your manager is a good manager they will offer you support
If they are a poor manager the suprise and embarssment of being put on the spot will likely prompt them to offer short term support anyway.
If they are a crappy manager even if you stink at your job unless you are under 2 years in the job they have to follow the law and you will have time to look for a new job.
So you will get paid and can pay your rent and pay your bills during this next month.
So deep breath and be positive that it will work itself out.
Long term your role created a skill set that can be transferred to another job.
If you are willing to work 2 jobs and were employed by 2 employers you will get a new job with someone who admires your work ethic.
Give yourself permission to go through a grieving process.
And your children will have a lot to process too.
The police will have contacted Social Services on safegarding the children you can call them to and see what support you can acess.
They may also have better "local' lists for legal aid etc
Even now you can still love him.
But no matter what you have to leave him.