I have had chronic fatigue for about 20 years. It's not the kind that has had me bedridden for twenty years. It kind of goes up and down, but mostly down (low energy). I've wracked my brains trying to figure out what caused it but still have no idea. My best thought is possibly massive stress for a long period of time burned me out. Recently my doctor perscribed a drug for me called Provigil. It is usually given to patients with narcolepsy,sleep apnea and also to MS patients to relieve their fatigue. This has worked wonders for me. I'm no where near olympian but it has greatly increased my energy level. I have no side effects except that now I also need a perscription drug to sleep. By the way there are sleeping perscriptions that are non-addictive now. This is definitely worth the trouble of making an appointment with your doctor and asking for. If you're anything like me, you're sick of going to the doctor and not getting any help. Try to make the effort anyway.