Take the time to find and copy all paperwork, keeping originals where you can.
If any joint account move half into your own account. Make sure you have the important documents relating to your son and copies of the house douments, his job, salary and pension docs.
Remember 50/50 split of assets is the starting point ad you are entitle to some for your son as primary caregiver as after divorce all he is liable for his child maintenance. His pension should be shared also. Depending on equity and any job that you secure you may be able to get a small place. If not keep your equity safe for the time when you can afford to buy and when you are employed in a better job.
Download and print and complete he divorce forms and read the guides at divorceonline. You do not need a solicitor to complete them as they are actually very straight forward.
Look into universal credit and what help you will get with childcare.
Get ready to put in a cms claim.
Contact women's aid and get advice and attend the freedom programme when lock down has ended.
Know you rights and check out the rights of women website.
Find somewhere to live.
Claim universal credit as unemployed if necessary and continue to job search. Claim for rent if needed also.
Pack your things and leave.
Let your family help you and tell them the truth don't hide things from those that you trust. It doesn't help you in the long run. This is not on you. This is his fault.
Let you child know what's going on and the local library has great books to help children. They are mostly online at the moment.
Get the divorce papers sent off.
Don't give him any more access than is the standard as it did not step up when married. Don't feel guilty, you are the primary caregiver and your sin deserves consistency. But also don't use him as a weapon, if he does magically step up, it can help you with pickups dropouts and working buy don't hold your breath with er way. Plan as if he is going to be mean and obstructive but do not go down the route of being obstructive yourself.
Keep a record of everything, do not have conversations on the phone or via text oast any everyday pleasantries and confirmations of what you have already discussed via email.
Discuss everything important via email so you have a record.
Universal credit is shit, but you will be better off than you are now. Eventually and hopefully you may get a job that means you did not need to rely on extra help.
Good luck op but please do leave him, you are living a crap life at the moment and you are modelling to your son that this is normal.
My children were the reason that I left my abusive ex, Do you want your son to treat his wife like this, as he grew up to think that your situation was normal?