Not sure How Much Longer I Can Live Like This

So here is my story. About a year ago,, I was diagnosed as being cancer free and returned to work. Ever since this has happened, my life has been very difficult when it comes to work. At work,  my supervisor has been giving me a hard time about a lot of things.   My supervisor put me on two final warnings.  Then I work through three months of worry, high levels of anxiety, and feeling suicidal for days, weeks on end. Last week, after I got out of being on the warning for these two things by meeting goal for three months, they put me back on a final warning, after only being warning free for a day. Emotionally, I suffered a nervous breakdown on Friday morning, and could not get out of bed and called out of work, and stayed in bed until 2 in the afternoon. Tomorrow I am returning to work, but am enormously scared and anxious about what will happen. Every day I go into work and worry if at the end of the day I will have a job or not. This job is putting so much stress and anxiety on me, and I seriously question if I want to live anymore.  I am just done and wonder if there is any reason for me to BE anymore. If I were to lose my job, I think I would go insane with the job loss, and be most likely to act as I would lose the room I am renting, would have to sell nearly all that I own, and live out of my car. I would rather die then face that.