I got a thing in the mail from the Red Cross telling me that when they tested my blood after my last donation a few weeks ago, they found that I had a high platelet count, and I am eligable for platelet donation.....have any of you ever done this? What does it involve? More specifically, is it more painful or will there be a higher risk of my passing out than when I just donate whole blood? ...cuz, I sorta pretty much passed out this last time. I'm not going to let it stop me from giving again, but I'm more cautious than before.