Hi there - I don't really have a clue what I'm talking about but was recently in hospital because of Bradycardia & now have a load of Cardio tests to undergo. I noticed the Cortisol level mentioned in the Drs letter looked it up and saw a reference to hyperthyroidism but I could be barking up the wrong tree completely. It may be a case of a little info in the wrong hands being dangerous !!! Lol.