Let me ask you a few questions about this pain:
1. Does it get worse with movement?
2. Is it in the shoulder joint?
3. Do you have nausea with it?
4. Are you short of breath?
5. Do you smoke?
6. Do you have high blood pressure or high cholesterol?
Thanks for the information.
With you family history, I certainly would discuss this with your doctor. I don't think the headaches are connected with this pain unless it is a muscle spasm including your neck and that can cause headaches.
However, I would expect there to be pain with movement then and that is not the case as you have stated.
So it is possible that this could be cardiac related and it is called a "soft sign" meaning that it needs to be explored. Make an appointment with your provider as soon as possible. This is not something that you need to go to the ER for right now but does warrant examination.