No, work is not always like that. But even jobs that we like very much could be oppressive at a point. On the other hand, depression can make us feel much worse about working. Sometimes depression works " a priori", so our tolerance to frustration is too low. In my experience, the only thing that saved me when getting too frustrated and depressed about work was to think that that situation wasn't forever. Nothing is forever, actually, although sometimes it is hard to cope and hold some hope for the future.
To tell you something about myself now, I am still at the hospital, frustrated because they want to release me even though I am not OK. They do not want to try alternatives. This was supposed to be the best public hospital in town, but it is no longer the best one, clearly. They do not want to deal with patients that ask questions and ask for second opinions. Anyway, I have to keep fighting or let them kill me slowly, by neglecting me. I am tired and sometimes sad, but I feel that life in me wants to live.
I am getting therapy and fluoxetine in here and I feel it is helping me.
Ok, this is all for now. I think of you and wish you find a better job