I was hunting for info on how and if Hypothyroidism affects Cortisol levels and found this paper. I've been feeling weird with a racing heart the last few weeks and think that perhaps Cortisol is to blame. I am one of those unfortunates with a TSH over 2 but in range.
From the paper;
"these preliminary result suggest that a TSH >2uIU/L may be abnormal"
"These studies all taken together suggest a physiologic feedback loop where lower thyroid function increases cortisol, but cortisol feeds back to reduce TSH."