The cortisol/stress business fits me, too (though I don't know whether that rules out it happening in other blood types). I keep an eye on the blood type plan, but don't follow it strictly. Also, I have never taken the secretor test but have found that following the secretor plan does very little for me . . . it was only when I follow non-secretor guidelines that I notice much difference. A message board opened recently at dadamo.com . . . in case you haven't seen it.

My Cortisol levels were once so high, they tested me for Addisons. I am an A too.