Yes, I can't believe you are mentioning it. I thought I was just me. lol
You described it so well too.
I'll give it a try.
At first they were more like pin pricks in different areas of my breast area. (3)
When I felt it in my heart area it was more like inexplicably warm bursts, like what one experiences when one is in love, on a mini-nanoscale, the burst's warmth waning as it spreads out. Stops feeling once the warmth goes out half an inch.
It happened in my back lung area yesterday the warmth waned out a little farther.
All together after 2 weeks I have noted the sensation maybe 6 times total.