I can't believe what people write here. You don't need to change jobs, just sit down with your manager, tell them your pay has been stagnant and doesn't reflect your performance.
"I am deeply hurt and disappointed with way corporate works. I feel cheated." I'm sorry but this reads like it's written by a whiny teen.
Also as a side note. Extra work does not directly translate to improvement of your state. You first have to make sure that it is a) noticed, and b) called for.