What Causes Chills And Shaky Hands And Legs?

Hi Doctor: I was on the treadmill last night immediately following a large dish of pasta ( may not have any relavance, I was on the treadmill for 35 min and after felt really dragged out. I sat on the couch and started to feel achy in arms and legs, then I went upstairs to undress and started to shake uncontrollably, I couldn;t even hold the toothbrush to brush my teeth or wash my face, I hopped in the bed and was shivering, My husband took my temp an it was 100.1, I still don;t know if it was the working out to cause the chills or the fever, but I have had a fever before and I never had them so bad whereby they affected me getting washed and dressed. should I be concerned?