Thanks for writing to the forum!
A high white blood cell count mainly indicates an infection or an inflammation. You have been tested for various infective pathologies. Recurrent or chronic fever can also be seen in SLE, rheumatoid arthritis, Polyarteritis nodosa (PAN) and other auto immune disorders, UTI, drug fever, glandular fever, HIV, STDs, endocarditis, parasitic infestations (some have been ruled out in your case), fungal infections, lymphomas and other cancers etc.
Hope this helps. Do discuss this with your doctor and get yourself examined. Please let me know if there is any thing else and do keep me posted. Take care!
Your symptoms pretty well match an infection. It may also help to see a tropical disease specialist, since certain tropical diseases cause similar symptoms.
Good luck! And if you have a moment, be sure to tell us all what it was.