Here's my question: why do the miserable symptoms of an exacerbation disappear suddenly? Now, by "suddenly" I mean just that: immediate relief for no discernible reason. For over a week I haven't been able to do much of anything except care for my own needs. Had to cancel all appointments, couldn't walk any farther than the mailbox, you know the score. Then suddenly this morning at approximately 11:00 AM the misery disappeared. I was able to walk normally, the exhaustion and shortness of breath eased, and my ability to concentrate has improved. I don't get it. Why does this happen? Have you experienced this? Have any of you read anything about this? It feels as if someone plugged me back into the electric outlet. But I know I can't expect it to continue. The plug loosens and drops out as quickly as it goes in. What the heck is going on?