My wife is having fever for last 15 days. All the test have come negative which include dengue, typhoid, malaria. Blood count s also in normal range. Symptoms are sever chill which last for half and hour to 45 mins and then follows high fever touching 102/103. Fever lasts for another hour or so n then for rest of the day she s completely fine. She s having this severe headache during fever which gets mild in other times. Doctors are not yet able to diagnose it to any particular disease or infection. I just don know what else to do? Its been 15 days now. Every day she gets this fever once.