Once you begin living with any chronic health issue, you really appreciate good health. When you have up-and-down conditions, you get to appreciate this on a micro-level!
Living with both multiple sclerosis and fibromyalgia (I am doubly-blessed!) I never take the good days for granted. I manage my body to maximise these - with diet, exercise, stress reduction, sleep, relaxation, mediatation, supplements, natural therapies and medication. Some times it all runs like a well-oiled machine, others it is more like an old clunker that needs to be sent to the wreckers!