I used to have strange chest pains too, that would start near the center of the chest and migrate towards the chin. Mine would start all of a sudden and last about a half hour or longer. It was so awful, that I didn't know what was going to happen.
Eventually, I linked all of this, including my fibromyalgia symptoms to my mercury-silver dental amalgams. Before I had the amalgams replaced with less toxic white fillings, I could control it two ways. First, I found calcium pills seemed to help - just one is all I needed. Secondly, if I took deep breaths and expanded my chest cage to the extreme, stretching the muscles, that would help relieve it too.
I'm cured of all of this now. I write about it, as you might know, quite a bit. Your pains sound different than mine, but I thought I would mention it anyway.