First, <3! Thank you very much, fellow literal lifesaver; a gallon of blood donated is nothing whatsoever to sneeze at. As far as the tally goes, if your donations were through the Red Cross, they should be able to pull up a history of your prior donations regardless of location. Mine have all been within the same state, though not the same town or county, so I could be entirely wrong about their ability to pull records nationally... but it would make complete sense if they could. I have zero familiarity with other organizations and how they do things record keeping-wise, I'm afraid.

I'm sorry donation has a tendency to foul up the rest of the day for you, though. :(