Welcome to Health care magic.
Thank you for asking the query.
In my opinion this is not heart attack
The pain at the back and in the spine does not come to the front just below the collar bone. The pain you are having in front and at the back are two separate pains. If I was your treating physician i will do the following:
1. Take detailed assessment of your mood and anxiety
. Sometimes such pains are associated with depression
and anxiety disorder. Treating depression/anxiety improves the outcome of pain as well.
2. Get your x-ray spine done.
3. Examine the throat and chest for any abnormality.
4. Get an ECG done.
5. Consider starting anti-anxiety and pain modulating medicines.
I hope this helps you.