Not knowing what you want or if you're getting it - poor planning.
The feeling that there's too much to do. One can have this feeling even if there's hardly anything to do at all.
Not enjoying your job. This can be caused by lots of things, for example, not knowing what you want, not eating well, etc. However, most people always blame their jobs.
Conflicting demands on the job
Insufficient resources to do the job.
Not feeling appreciated.