Is this an emergency?

So I've been having chest pain on and off ever since June. I went to the ER twice because of it, and it's NOT heart related- both EKG's came back normal, and the blood work was also normal, meaning no blood clots or anything.

Anyways, I started having the chest pain today (left side), and then it stopped and the pain went to my upper back on the left side.

I don't know if I should go to the ER or not- they said the chest pain is nothing serious.
Is this an emergency?
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