If you haven't done so while you've been out sick, please see a doctor or therapist for the stress. Heck, even if you've been to a doctor or therapist about this, please talk to them again so they know that so far, it isn't working.

At this point, you can probably safely go to the ER and tell them you fear you'll kill yourself so that you'll get urgent help.

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This stuff you are going through, it can get better. It doesn't last. You can learn to deal with panic attacks, you can change jobs, and so on.