i m a 57 year old female. 5 8 132 lbs. Exercise vigorously daily. Only prescriptions I take are ambien or occasionally klonopin. Both are for my insomnia. 7 months ago, I developed horrible stomach pains that lasted for about 3 weeks. These were accompanied by occasional low grade fever, aches and rarely vomiting. Tests for giardia came back negative. Though he original problem disappeared, I m now plagued every 6-8 weeks with a bout of fever, stomach upset, headache and body aches. These recurring episodes last about 2 days. What can this be? What can I do to make it stop?