I have very infrequent mild to severe pain that starts below my sternum, radiates to my right chest and then the right side of my neck and jaw. I ve experienced this for over 30 years, and it rarely happens more than once a month. Sometimes the right side of my face feels hot as well. This has not increased in frequency, but the last episode, about 30 minutes ago, was much more painful than previous episodes.
As per you explanation I realize you need to undergo for through testing for your cardiac as well as brain and spine.  Based on where there is a problem the treatment can be planned.  Random suggestion may not be useful for you since it's a chronic problem so do get your self checked well. Take care.