this is probably totaly unrelated to your chest pain in rght side during exercise, but i've read that people usually exhale when their right foot hits the ground while running/jogging which causes the liver to be stessed somehow and cause right sided cramping. While running, try exhaling when your left foot hits the ground, Like i said, it is probably not what you're feeling, but maybe worth a try. good luck
KAD,
Thanks for the post.
Your symptoms really do not sound cardiac or related to your pacer. The quality and timing of your symptoms sound more pulmonary in nature, one thing that comes to mind is occult Asthma or reactive airway disease. Your electrolytes really shouldnt have any of this type of effect either.
I would discuss the symptoms with your physician. Also, keep up the exercise.
good luck