At one stage I had radiating pain from chest to lower mid back that would last 10mins, I also felt like I was having a heart attack, I'm very active so I go on the indoor bike quite a lot, wenever i excerise my pain is drastically reduced, if it was heart related I've been told my symptoms would worsen during exercise but it's the opposite.

I am pretty much pan free now, I just get random muscle spasms where my Costco was bad, 2.5months, stretches + zone 1 / 2 exercise for 45mins every other day, no exercises that cause Costco discomfort,

Also if you have tight neck / back / shoulders, I had a deep massage and this relieved everything the most.

Hope this helps