Respected user, hi I evaluated your query thoroughly. *As EKG, X-ray , blood tests are normal it is the condition which is not detectable by these means. *Reasons range in vivid directions - low haemoglobin levels - costochondral - neuritic - referred pain - reflux of stomach acid - psychological ( in absence of anxiety ) - left subdiaphragmatic / splenic pathology etc. *Presently should undergo for following steps & should follow up after 15 days about progress for the same. @ Avoid all oily / spicy / nonveg stuffs / fatty / excess ghee / sugars @ Have small quantities of food at regular intervals @ Avoid prolonged fasting / overeating @ Do regular light exercises , Deep breathing exercises with YOGA at home @ Avoid smoking / tobacco / alcohol in any form if consumed @ Avoid weight lifting / over exertions @ Maintain your Haemoglobin levels , BP , Blood sugar, Cholesterol levels @ Have adequate sound sleep of 8 hours @ Avoid stress @ Have diet rich in proteins, iron , vitamins, minerals , multivitamins, anti- oxidants . Hope this clears your query. Thanks for using Health Care magic & keeping trust in our medical services Wishing you a very happy healthy life ahead. Regards dear take care.