Should I go to the ER?

My first thought is you might be having some stomach pain based on how you are describing the pain - the stomach is right below the end of the rib cage. Take an aspirin right now. If you are not having any other symptoms, no shortness of breath, no pain in the left arm, no perspiration or any other kind of distress except the sharp pain, I'd wait one hour and see how you feel. Sharp pains tend to be associated more with gas pains, or other issues, not heart. Just hold on for a bit - try drinking some warm tea.

If you get no worse or no additional problems come up it may be something to see a doctor about but I don't believe it is what you are thinking - I don't think it's your heart. But stay up for awhile and monitor yourself. Just try and take it easy. Make sure to take aspirin - aspirin provides protection in the event of a heart problem. But for me the big clue is the sharp pain - I've never seen sharp pains in heart problems. Read about one thing that causes sharp pains below:

And if your symptoms do get worse or your pain increases, then have someone take you to an urgent care facility - do not drive yourself.

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