everything you have written on here tells me that. True heart related
chest pain is not located on one side or the other on the
chest.
Pain, if you are having it while resting or sitting in a chair, that is heart related would be caused by a very severe form of heart disease, which would have easily shown up on an EKG. The numbness could be a neck issue. Have you considered seeing a nuerologist? A gastroenterologist? You might want to consider seeing one or both of those two specialists.