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I'll be glad to help. I am reviewing your question now and send you my thoughts shortly :)
The most important issue to rule out in your case is any cardiac reason behind the discomfort - which is actually quiet common.
This can be easily done with an EKG , ultrasound of your heart and a variety of stress tests.
I would recommend for this to be done on a urgent basis, because a heart attack can be fatal where as a muscle strain (can cause similar symptoms) would not be.
Wish you best of luck.
Please let me know if you have any further questions.
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you're most welcome.