Let me give you some advice from personal experience.

I have had the same issues in the past (except for absenteeism). I have had to become SCRUPULOUS about what I say and how what I say is perceived, verbally and in written form. I have learned to put a smile on my face and act VERY pleasant, even when I don't like the people I'm with or the people I have to communicate to.

I have had to accept that work is not "fair" and while other people's issues continue on, I really don't know if they're being addressed and it's not my job to point out other people's failings, as it only calls into attention MY failings.

I am, to put it politely, a "difficult" person. Very negative. I have been counseled in the past on things I have written and said, my "tone" and so on. So, I really do know what you're experiencing.

You can make 1 of 2 choices here (I have done #1 and have been able to stay at my job for 10 years now):

1. Stay at this job knowing your behavior is being examined for progress with the behavioral issues and attendance. Stop pointing out the unfairness of things or what your co-workers lack. Learn to stop paying attention to it. It can be done. Worry about YOU and what YOU control, which is your behavior and attendance. You shouldn't be losing days due to "depression and anxiety". If you are, you need different treatment. It's not like you're unable to work, so you aren't disabled. If you are seeing a psychiatrist for your medication, make an appointment ASAP, be honest about the trouble at work and why you have needed to be off. Ask for adjustments to your current treatment or different treatment.

If you are not seeing a psychiatrist and/or are not taking medication, GET ON IT. Work closely with your docs so you can improve and get to work every single day. Yes, you CAN go 6 months without being off for depression/anxiety. Get counseling if needed.

2. Second choice is to find a new job BEFORE YOU ARE FIRED OR QUIT. When you get a new job, take the advice in item #1 from day one. Make sure you are medicated and getting therapy from the start so the old problems don't crop up again.

There is a 3rd choice, and that is to declare yourself disabled from your depression and anxiety, if you really feel you can't overcome these items.

I wish you luck, as it's a really difficult problem to have and requires you to grit your teeth and stay quiet A LOT. It's not fair, but it is life.