We Live At Altitude - My Husband Started Off With

We live at altitude - my husband started off with a headache yesterday morning. By lunchtime he was in bed with hot sweats and seemed to be running a temperature. Later in the afternooon he began shaking uncontrollably and couldn't get his breath properly. I managed to calm him but then he had a really bad cold clammy sweat before sleeping. Today he's the same without the shaking - sleeps a lot and goes from hot to really cold and is still running a temperature. He has had these symptoms for about three years - usually lasting 24 hours. We do not have GPs here - should I take him to a hospital? or can you suggest medication