7 Stages of Grief? Why?

This was taken from a post by vj over at the workaholics boards.

The stages of grief as delineated by kubla-ross are:
Denial (i'm fine)
Anger (i don't like what i am seeing or feeling, e.g., loss),
Bargaining (if only i hadn't let that job eat up my time, if only my
partner made more money, if only...)
Depression (i am so so sad that i lost my time, my energy, my health,
that i don't know who i am...)
and finally, the great reward:
ACCEPTANCE! yay!

I read this and when "WHOA!" I feel like I go through these cycles of emotions a lot, in a cyclical fashion. Why the pattern? What am I grieving? I feel like I especially get stuck in Bargaining and Depression most often; but then again maybe I spend just as much time in Denial and Anger too.

Definitely more here to chew on and mull over. I will be back to spit it out later.