My husband is 42, seemingly healthy. He has been experiencing very random episodes of severe chills, practically rigors, with temperature spikes up to 103. It happens suddenly, and during the episode he can hardly talk or walk due to the stiffness from the chills and shaking. Once I get Ibuprofen in him and get him as warm as possible, the episode passes and the fever goes away. He is fine the next day, and has no other apparent symptoms. I am terrified. We have no insurance and testing is so expensive. He has had blood work unrelated to these episodes, where his white counts were normal and his HIV screen was negative. What type of doctor should we see? What could cause these random spikes in fever? It is very random, happening anywhere from once every 2 weeks, to 1 every 3 months. Any advice is so appreciated!