take a close look at your environment, at work, at home...has something changed in the past that may have made these symptoms creep up on you? I dont want to make you paranoid, but I was exposed to mold and couldnt figure it out for a long time because I have allergy problems anyway. I think if it was that, you would have a sinus infection..soreness in the joints, loss of appetite, dizziness, fatigue. PLEASE talk to a doctor about this!!!!!!! And write everything down that you want to talk about before you go..be prepared..help the doctor help you!! express a concern if they just prescribe an antibiotic, and try to send you out the door.. antibiotics can harm benefitial micro-organisms in the body, and you may need to replace them.
Im no health expert at all..and I didnt mean to imply mold exposure was the problem..I just wanted to share my personal experience. maybe your issue is chemical related. Dont be stubborn like me..dont ignore it untill it really gets to you! Your body feels weird, because it is telling you something has changed, or is wrong.