My question is what should I have him test or look for? first of all, no, I am not pregnant. my symptom is feeling very fatigued all the time. Sleep or caffeine does not help. I feel lethargic.
hmm….it's awful to be sick and tired of being sick and tired. 
most people don't understand that there's a difference between being tired and being sleepy.
Have him test you for chronic fatigue symptom…best thing to do is make a list of any other symptoms. The more info, the better
Good luck 