I'm a 32 year old, relatively fit male.

I started to eat a very cold sandwich which just came out of the fridge and after taking just 2 bites, I had sudden very bad pain in my heart or an area close to the heart. I've never experienced this before and it terrified me.

I stopped eating, got up, walked for 2 minutes and ate the sandwich once it was a bit warmer and the pain so far hasn't come back.

What could this indiciate?