Steve,

I personally haven't, and I've had a *LOT* of coffee at various times. However, it affects different people in different ways. One's response partly depends on one's overall emotional disposition as well.

Coffee "works" by delivering caffeine to your system rapidly. Caffeine is a stimulant which causes the release of adrenaline. Consider the fact that adrenaline is what is released during the fight-or-flight response.

If one is prone to panic or anxiety, it doesn't surprise me that coffee can produce a panic attack. You do well to be cautious in your coffee consumption.

p.s. Caffeine in tea is absorbed much more slowly, due to the phenol content of tea. Caffeine in green tea is absorbed more slowly still, than that in black tea, because green tea has even more phenols.