Skink's right that if nitroglycerin relieves the pain, that's a good sign it's angina (heart-related chest pain).

You've been under lots of stress lately, Slipknot. That's part of why I'm trying to persuade you to go on in. Even if you don't have a family history of heart disease, you can easily still be at risk yourself. The other thing is that gallbladder pain has an eerie way of masquerading as heart attack pain in men.