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
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 ...
Dr.J.Kingson John David