Quitting without job lined up

I’ve been at my corporate job for over 2.5 years and I’ve finally reached a breaking point. After my internal promotion in September, my mental health deteriorated, I’ve cried at work numerous times, I’ve had multiple panic/mental breakdowns. I haven’t slept peacefully in months. Sometimes I wish I got hit by a car so I can have a few days off in the hospital. I’ve been seeing therapists but I know if I quit this will instantly get better.

My workplace is very demanding and there is a lack of WLB along with micromanagement/turnover.

I’m planning to quit without anything lined up other than a few interviews. If I take this time to upskil/do some professional certifications will i still be hurting my career forever?

Financially I am ok, my husband still works and we have a big cushion of savings that will allow us to get through for a while. What should I do?

Update: thank you everyone for the replies! I ended up putting in my two weeks but my manager pushed me to take FMLA instead so I have time to think about it.