I really feel for you OP. I hope you can enjoy the fresh air again. Breathe deeply, smile and enjoy not being in work.
I had an awful manager years ago. A terrible man and on my back constantly. I phoned up one day and said I won’t be working for you again. I walked in and handed back my car and laptop that day. Whilst he was going through the formalities he told me to get him a coffee. I simply laughed and walked out. Felt amazing and free outside. I was in a fortunate position where I could move in with my folks for a while whilst I got sorted.
That summer I painted fences all day and it was amazing albeit temporary.
This experience has always taught me to have an escape route planned/safety net in place.