Every body's body chemistry is different. I knew a guy who would smoke a bowl of meth
and go to sleep. The fundamentals of amphetamines
is that it creates the secretion of adrenaline
into your blood stream. This does a number of things including, obviously speeding up the heart rate
dramatically. If the 3 lines were done together, there were "large" lines, and if your tolerance was somewhat low, the sudden shock
to your system could have created a higher pressure around your heart. this would restrict the volume of blood going through your arteries and creating the faint feeling and the pressure in your chest.