Hello, I understand your concern. In order to get a clear idea about your symptoms, you have to understand that methamphetamine is a vasoconstrictor, meaning it narrows the bloods vessels. What you have been experiencing, chest tightness and pressure, is your heart s blood vessels being constricted and thus starving your heart of oxygen. This is exactly what happens in a heart attack. The coronary arteries (the vessels responsible of nourishing your heart with oxygen and nutrients) narrow and the heart muscle is deprived, leading to decreased function and ultimately no function at all, i.e. death. So, yes, your symptoms were your heart trying to send you a message that you are starving it. Next time there probably be no warning. So please make sure you stop taking meth before it is too late. There is plenty of help available if you want to. Drug helplines and rehab clinics are everywhere, you just have to want it. Wishing you all the best