Chronic fatigue - the prognosis

I've had many estimates from healthcare professionals over the years relating to a possible recovery from my mystery illness varying from 3 months (you'll get over it), to 1 year (think of it like glandular fever), to 10 years (this is how long it will take your immune system to adjust), to never (you have an incurable illness), and finally, to the more reliable, we don't know. During my most most recent meeting with someone who works with chronic fatigue patients I was told this:

10% don't recover
80% learn to manage their illness and live a meaningful life
10% fully recover

Is this good news or not? I guess, statistically, there's a chance of something, but my take home message was this: there's no going back.