Get a tropical disease bloodtest done - most doctors have a serious lack of knowledge in this department. I have had this exact same feeling as described in her previous question, TWICE, for prolonged periods. Both times this has been caused by TICK BITE FEVER, specifically the bacterial strains of RICKETTSIA. There are different strains and different virus names all over the world. Both times I went to different doctors and both times they did not believe me, refusing the possibility, until I insisted on the bloodwork.