I'm a chronic illness sufferer, too (although my issues are mostly in fatigue, and food sensitivities that seem to compound by the day), so I can say a hearty AMEN to the comment about the discouragement that comes from finding no end in sight. Having a dysfunctional body feels like the worst kind of betrayal.

But you're right. Sometimes anger is useful for getting us out of our complacency and making us do something -- anything -- different.