My “unlimited” PTO policy is ruining my life. What do I do to stay sane while I look for another job?

I (27F) work for a very intense tech startup with an “unlimited” PTO policy. I took last Friday off, had this Monday off as a company holiday, and planned to take tomorrow off.

Last Friday, I wound up getting pulled into an urgent project and worked 80% of the day. This past Monday, it was a “company wide holiday” but all my coworkers were online and working anyway, which made me feel forced into working since people were slacking me asking for things, so I was online all day on Monday. I was just informed today I have to join a call at 10 AM tomorrow morning. I am losing my mind because I haven’t taken a real day off in many months.

I know I could dig my heels in and insist I take the day off I put in to take off, but this will only hurt my standing with the company. Our company CEO works 7 days a week and those who overwork themselves are rewarded, while those who take time off are penalized. They don’t say this is why people are being let go, but I recognize the patterns. My boss is amazing but he also is forced to work on his days off and can’t really help me. In fact, he’s supposed to be off today and responding to messages as we speak

I love the work I do. I like my coworkers. I work from home. I make great money. I know this isn’t a healthy work life balance, but I’m not having a lot of luck in this job market and leaving feels like the wrong decision.

What do I do to set boundaries and stay sane in the meantime without losing my job? I’m thinking about rescinding some of the hours I already took off just so they’re not recorded as days off. But I am really not sure what else to do. This is starting to affect my health after two years and I am worried I won’t find a new job before I totally burn out