Op, I am also stressing out reading this. The inequality in your relationship is awful. There is a balance of power tipped against you. I bet you feel anxious and stressed about money.
I experienced similar when my stbxh was raking in money (self employed, erratic income, but high nonetheless). We had a high standard of living but a completely inequal access to cash. I would be showered with expensive gifts on my birthday, Christmas, Mother's Day, but would get into debt reciprocating. I was also paying all family expenses out of my 'allowance' and would feel ashamed and embarrassed when I couldn't pay my credit card bill. I would get a benevolent 'it's okay, I'll pay it FOR YOU' response.
When I did the calculations and meekly presented them, I got an increase. There have been 'why don't you get a job?' questions addressed to you. In my case, I had four very young children, an agreement that I would stay at home, and no support from himself for any free time - I wasn't ready or trained to go back to work, and paying for childcare would have been impossible.
Now that he has gone, I am still living on the 'allowance'; I work 30 hours a week, and am scrimping. But the problem wasn't whether I worked or not: it was that he was mean, and saw every penny as his money to dispense (or not) as he chose. We had absolutely more than enough to go around : the problem was that he didn't want to share it, and it was like drowning living with someone holding five life belts saying 'ask nicely.'
You going back to work won't solve this, at least it won't address the root problem. Which is him.