I take methotrexatexate and hydroxychloroquine for RA. Started in Feb.2014. June 21 I had a fever of 100, and severe chills for a day and all night. Wed. June 25 I was cold, shivering, and very hot to the touch, but no fever registered on thermometer. This lasted all night, and all Thursday, and when I went to bed the heat from my body finally subsided at 4am, when I broke out into a cold sweat. I still have periodic chills today and the temp. is 75. I also suffer from fibromyalgia.