Red Rock, whatever came from your endocrinologist appointment? If I recall, you were experiencing--at least at one time--a hyper phase from Hashi's. If that's the case and you haven't otherwise gotten it under control, then that would might explain why your HR is running high. It might also explain muscle weakness, fatigue and/or generally feeling like you're not in very good shape.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher