I full agree that you need to communicate with your Dominate. And not knowing what your current "rules" are I am going to toss this out there as well...

I know at times when i get to feeling that way, normally if i stop for a moment and think about the day and what happened, etc. i realize that i have served my dominate(s) in more ways then by just following the rules.

An example would be doing something that isn't a rule but doing it anyhow because you know he would like it... wearing a favorite color, working on a favorite position, etc. It is small but remembering why you are doing it may help to battle that feeling at times.