Dear friend , Thanks for your query to Healthcare Magic .. I read your concern and your symptoms are more likely to Cardiac origin , I suggest you to do an EKG test and make sure there is no changes in T waves . Your belief in costochondritis if EKG shows normal suggest that it can be cures by Ibuprofen and Ranitidine ... Do not be worried , In case of severe pain consult nearby physician and get medications injected to get relieved in few minutes , Do not let pain to be on site for more than 20 minutes . You can ask me directly if you have furthur queries ... Regards Dr.J.Kingson John David