My brother has A fib and has had it for nearly a year now....procedures to  corrct it haven't worked.  He has been experiencing severe chills lately....needing to go under an electric blanket to get comfort. No fever. The chills last maybe an  hour or two and then disappear. Could this be related to the meds he is on or the A fib??  The chills leave him "wasted" and no energy.

Summarized question: Does atrial fibrillation cause shivers?