Comment roby (Score 1) 495
All the above advice is great, but the short version is this: your employers are either idiots or abusers. Get out.
In my experience, it is very, very rarely in your best interest to do a job you don't want to do, for too little money. At least for more than a few months. If the job responsibilities are shifting, then the organization really needs to hire someone who wants those responsibilities. And if they can't hire such a person, and are trying to save money by manipulating you into doing the work, then they are taking advantage of you.
So keep your good attitude, but ya I agree with others who said it's time to start looking elsewhere before the environment becomes more abusive than it is now.