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.
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.
Mystery solved?
http://www.trenchmice.com/scoop/433/microsoft-cio-underling-took-family-leave-before-firing/