I Am A 28 Yr Old Female That Had Sudden

I am a 28 yr old female that had sudden trachea pain in the area btw the clavicals towards the end of the day; went away at one point but ate a pear and in started again. Also have pain btw shoulder blades, mild SOB (PO2 stats 98) which is somewhat relieved after burping. I had anxiety attach Monday and Tuesday night, Tuesday had an EKG done that stated bradycardia and arrhythmia. Am I just experiencing heartburn or is it something more serious like a heart attach that I should go to the ER to get checked out? I've been under the weather since my panic attack Monday night and haven't recovered to my old self.