what other symptoms do you have? Chronic headaches, eye pain, neck makes a cracking sound, sleep issues, lymph node enlargement, joints and muscle aches, bowell and stomach aches occasionally, stabbing sensations, gluten and sugar sensativaties? Crhonic fatigue? "brain fogginess"? odd bowell movements? excess flatulence? sometimes vision disturbances? sound and smell hypersensativity? anger issues or anxiety? If so , and these symptoms seem random, like you feel "ok" for a few days, then feel "wiped out" on others, you might have a Mycoplasma infection causing your problems. this will not show up on any standard medical test.
Have you been diagnosed with either a multitude of problems or been dissmissed as "nothing wrong" before? Do you remember the date when you ceased to feel like "yourself"?
Get a second opinion, like, yesterday.