I am on disability due to mental conditions getting in the way of me being able to work...and sometimes I end up feeling guilty about it. Though there is no reason to be guilty over things like that...it wont help and well its clear you need to take care of yourself, get the help you need that is the important thing...but you didn't choose to have depression or for it to effect you that much so its not any fault of yours that you're unable to go to work right now.