Happy to report I was experiencing a "thyroid storm" created by my thyroid medication that can create fast or slow heart rates as in the case of Graves- tachycardia- fast heart rates as was described to me. Everything has quieted down, my Synthroid has been adjusted. I am backing off of Carvedilol and now only taking Cozaar 25mg once a day. All is well, for now anyways...... Thanks to everyone for helping me...