For a summary of adrenal stress, there's a book on Amazon called "adrenal fatigue: the 21st century..."
But also, I've read other people getting palpitations when taking an antifungal that is strong enough to suddenly kill off lots of candida at the same time. Of course, palpitations can be some other reason, but this one reason is a known cause (just don't expect your doctor to understand or believe it.) If that is the cause for you, if you back off a bit on that antifungal and process with it more slowly, you may be able to kill off enough candida to not have those particular "die off" effects any longer with that antifungal.