What Causes Night Sweats Along With Leg Cramping In Person With Heart Disease?

Hi, I am a 54year old female who has had a double heart valve replacement in 2003. I was admitted to Casualties ICU in the early hours of the morning on the 5th Mach with Atrial Fib. Was advised to see a cardiologist urgently, which I did on the 16th March, who diagnosed me with a left atrium enlargement as well as moderate atrial stenosis. The cardiologist has added Bilocor to my chronic meds (Hexarone, warfarin, Euthyrox and Aspavor). I am suddenly experiencing heavy night sweats and cramping pains in both legs. Would like to know what the symptoms of the above diagnosis are and what I can do to improve my lifestyle.