Okay, well it doesn't quite work like you might be envisioning. It's really not a matter of where the vagus nerve is located, but rather the fact that the central nervous system is in sort of a mildly chronic and  heightened state of activity together with factors that may predispose a person to experiencing palpitations.

The vagus nerve actually innervates the GI tract as the pneumogastric nerve, much like a street can change names as you drive along it. I would suggest that the palpitations are far more a factor of bending over and compressing the abdomen, or alternatively stretching upward, rather than anything to do with tucking a pillow under your left arm. If there is air trapped in the lumen of the intestines, particularly where it presses upward against the diaphragm or undergoes a change in its position within the intestines or bowel, this can cause palpitations to occur through the left vagus nerve.

It's not as though the nerve is actually being rubbed or coming into contact with anything. We're talking more about neurotransmitter activity, in this case acetylcholine, being induced to travel along the vagus nerve to its terminal points, ie the heart, lungs, larnyx, etc., where it results in a palpitation among other things.

The reason you heart slows down to a noticable extent is due to the lack of feedback to the vagus nerve which results in lowered vagal tone. Soldiers who stand at attention too long often suffer from this consequence and it results in lightheadedness or actual syncope (fainting) if not corrected by taking action to restore vagal tone. In fact, this consequence can occur under a variety of contexts, which for instance explains why some people faint to a sudden frightening stimulus or when jumping up from a lying position after being bedridden for a day or so. Even the flu or other certain factors can cause vagal tone to be disturbed or lowered.

As for the "block," we actually use this term to describe more extensive degrees of latency for electrical signals to pass through the tissues of the heart, particularly around the ventricles. I'm not certain what you were observing on the scan, but unless it was using contrast to reveal a vascular narrowing in one of the vessels I would question what you were actually looking at, particularly since it would not be an actual blockade within the oriface or cavity of a ventricle.

Your symptoms would indeed be associated with benign palpitations induced by inappropriate vagus nerve stimulation and nothing to do with any type of pathology.

Best regards and Good Health

Just moving this up for when RLR...my only tranquillizer right now, is able to answer

As always, thank you so much for the time you spend explaining, which helps tremendously.

Even so, I have had the most terrible two days of palps..to the point where I feel so depressed at the thought I would have these now for life. If they were once an hour, or once every half an hour, I could maybe manage that....but they are every few minutes, sometimes constant and . The dizzy feelings come and go but mostly they are there. These have led to severe panic attacks and I cannot even escape them in sound sleep.

They are not around first thing but start around 1 hour after rising and just do not let up. I can now not shower without my husband being around so I bath and crawl out sideways as the dizziness is so so bad.

I am coming to believe that is right...but it is so weird that I can be having an ordinary day and thhen out of the blue, wham I am dizzy and have all the other symptoms