Mortgage is in his name only (at his insistence)
Was the house bought when you were married?
If so this should have been a red flag to you. Him insisting the house is in his name only, was already pushing you out of the finances.
You have a lot of reasons for not being able to get a job. I work in HR and have seen women come back to work after many years of being a SAHM.
What strikes me as an issue, is you don't see a need to work and you've not had any intention to work for the rest of your life. It seems you only started looking when he complained.
I don't know if you have daughters, but one of the reasons I wanted to work, was to show them a woman's place is not at home.
Could you do an evening job when he's home? Like waitressing or bar work. Or weekend work maybe.
There are a few jobs that don't need qualifications, but a willingness to learn and initiative are helpful.
When you're looking at jobs, think of what transferable skills you have. So you help out in the school, use that to demonstrate how you are adaptable and can adjust your communication to a range of individuals.
Then you can also show your organisational skills, by using examples around the house or again with the school.
What sort of help are you providing at school? Is it reading?
Maybe you can ask about helping out in the office to gain some Admin experience as well.
You'll feel a lot better earning your own money.