I experienced a sudden onset of bad left side chest pain which spread down my left arm?

Early this morning at about 3am I experienced a sudden onset of bad left side chest pain which spread down my left arm and a bit in my back. The pain was at it’s worst for about an hour, but

Problems with my heart, suffer from heart palpitations, please advise?

I have problems with my heart. Besides from suffering from heart palpitations on a regular base and occasional light hediness, I do have a very slow heart beat at 54 beats per minute sometimes. Other than that I feel fine.