Hi, may I answer your health queries right now ?  Please type your query here...My 20 year old son is almost always tired and sleeps a LOT.  This started 4-5 years ago and he had a very involved medical work-up at that time, but they did not come up with any cause or what to do about it.  What could cause this?  Is it worth trying a medical workup again?
Degree understand your concerns went through your details. I suggest you not to worry much. From the given description, diagnosis may not be possible. But I can suggest that your son could be troubling himself with depression arisen out of this medical work. He could have got things wrong and started worrying. That worry must have escalated into disappointment and depression. Lethargy and worthlessness are possible outcomes. Please consult a psychologist without delay. If you require more of my help in this aspect, Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe the needed psychotherapy techniques which should help you cure your condition further. Hope this answers your query. Available for further clarifications. Good luck.