I have a rapid heat rate to 110 bpm, I am fatigued, feeling as if I am not getting enough sleep (despite 7-8 hours), and feel overwhelmingly tired mid-day; and I have a headache. I can and do walk on a treadmill for 30 minutes 4 times a week. I am 56 yo, female, weigh 180, ht 5 ft 3, no other health problems