@Gingergrrl - I was reading some other threads here yesterday and notice your heart symptoms did begin at the time of EBV infection. Infections stress the adrenals and hormonal system in general, and if you were already adrenally stressed, for instance, which is not uncommon, and maybe additionally low on certain minerals, vitamins, amino acids, which is also not uncommon, a bad infection could tip things over the edge, causing chronic symptoms one would not expect from the infection alone. But never say never, I believe. Although a heart infection is the least likely cause, it is not one to be dismissed for that reason alone, but ruled in or out systematically as with every other potential cause. The cortisol test will give you a good foundation from which to assess things. I hope you had a more peaceful night's sleep last night and wish you luck getting the answers you need.