I have a question but I'm not sure how to go about it for work

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I suffer from severe anxiety and depression, and ptsd. My job has us do mandatory overtime. I feel so overworked. My panic attacks are getting worse. When I'm overwhelmed I get depressed and I get to a really low place. I don't want to sound like I'm making a excuse not to work. But I physically and mentally can't wait be overworked..