It seems as if many people still do not understand much about Chronic Fatigue Syndrome. I have worked with CFS (also calledME/CFS) patients for well over a decade now. I can tell you, without a moment's hesitation, that CFS is a horrible life-debilitating disease. It is referred to as a serious neuro-immune disease.
The disease was once thought to be psychological by some researchers in the 1980s, but not at all anymore. It is a very serious physical illness, with several common symptoms, due to the fact that it is in the main nervous system. There are some great websites now, where you can learn all about it. www.InvisibleDIseases.com, www.CFIDS.org, Phoenixrising.org... Those are probably the top ME/CFS websites.
This is an excerpt from InvisibleDiseases.com: ME/CFS (Chronic Fatigue Syndrome) is diagnosed after a process of exclusion, making sure that there is not a more common disease that is causing the person’s ailments. ME/CFS is generally defined by extreme fatigue, not relieved by any amount of rest or sleep, lasting at least six months and is accompanied by a number of the following symptoms: muscle, bone and joint pain; reactive hypoglycemia; irritable bowel syndrome; loss of brain functioning; insomnia; memory loss; brain fog; chemical intolerance; rapid sensory overload; sore throat; tender lymph nodes; migraine headaches; convolutions; uncontrolled weight fluctuation, palpitations and more.
Sleep problems are very very common, plus post exertional malaise, brain fog, flu-like aches and a lot of pain can begin as well. Many people become bed-ridden from the pain and exhaustion, it is so sad. Please do not go to just any doctor for this. Go to someone who is trained in this illness specifically. You wouldn't go to an eye doctor if you hadr hiv, right? In fact, many survivors of thsi isolating and "invisible" disease, have begun seeing hiv doctors due to their infectious disease backgrounds.
I am very sincere when I say this. If you really do believe that you have CFS, (which does not usually just 'go away' so easily) please go and see a specialist before it gets any worse. Most people have to change their lives drastically with this disease. It is very very sad. But if you have it, you should reach out to others in that community right away. I would look on facebook too for support.
Most of the (well intended) comments on your question here, are by people who have no experience with CFS themselves. I do have a lot of experience with it, and I assure you, it is very physical and very serious. There is more hope now though, with more promising research for treatment. My thoughts and prayers are with you. Keep your chin up, friend.