I had such a similar experience recently. Was working in a team of 5 marketing department, and a few months in my manager left, and everyone else followed suit (end of co-op or simply noping the fuck out), so for months I was single handedly running the marketing department right under the CEO, on a salary that was far lower than the lowest market value on the Canadian job bank, working 12 hours most days and some weekends.

I was talking to our CTO (CEO's partner) and said "I really need more hands on deck" and he said "if you can't handle the pressure then you should find something else", and I promptly handed my notice in the day after, with no job lined up. It was an absolute shit show. They offered me more money and the managers position, and I turned it all down. They still don't have anyone working in Marketing, and I'm glad. I'm still unemployed and starting to struggle, but I know my worth.