I have recently been diagnosed with Hypothyroidism. At the same time my GP picked up on a heart murmur. After undergoing tests such as ECG, chest x-ray and then an echo it appears I have Bicuspid Stenosis (congenital defect from birth). Actually the stenosis bit is degeneration over the years (61 yrs). As an ultra marathon runner, this little bombshell has given me some grief. I always keep a detailed training diary so I can see at a glance that my training has been in a steady decline. My question is 'how much of my fatigue and associated symptoms' is heart related or Hypothyroidism? Is it just a coincidence that this seems to have hit me all at the same time? I find it impossible now to run up even a small gradient, but I can still power walk on the flat. Apparently, surgery will be my only option at some point. Also my basal temperature fluctuates throughout the day and drops alarmingly when I return from a power walk/jog. When my temp drops to 33 I feel shaky inside and weird. I have experienced hypothermia whilst competing in the swim section of a triathlon and had to be dragged out of the water by safety crew. My temp never gets above 35.5 at its best. Having been so successful for so many years in sporting events this is all taking a bit of getting used to. I guess I'm faced with making haste but more slowly from now on!