G'day just been released from hospital following a bout of chest pain where an ambulance was called, because the pain was radiating down the L) Arm,

The ambo's showed a Sinus Tachy no ST elevation, but also showed a Right Bundle Brunch Block, Troponines came back negative CK negative and White Cell count was 9.6. the pain was relieved by GTN and asprin, and also some Iboprufen

Still having a bit of an ache in my heart and they are gonna do a stress test later down the line.

Any ideas as to what it could be?