Thanks for contacting Justanswer.
Have you consulted a doctor regarding this? Any heart investigations done?
The symptoms that you are having are most likely due to your underlying conditions such as reflux, costochondritis, and anxiety. The fact that the pain responds to analgesics suggests that the underlying cause is a musculoskeletal condition. Since you have been examined by your doctor please continue with the acid reducing medications and also the pain relieving medication. Please also ask your doctor for treatment of the anxiety which may in the form of medications or therapy.
Yes you may take Prilosec or Zantac which is available OTC and these will reduce the acid. For relieving the pain you may take Acetaminophen (Tylenol).
You are welcome.