When I was 12 I had Viral Encephalitis and a Blood Clot in the Left Temporal lobe of my brain. It was near the #10 or Vargas nerve and the Optic nerve. Also affected the autonomous nervous system and my equilibrium was wrecked pretty much.
Treatment in hospital required two separate craniotomies(opening the skull).
Without 4 units of blood for each surgery, the surgery could not have been performed and my only other option was an early grave.
I am a regular blood donor (71 donations to date) because the need for blood has been proven to me. In fact my own mother also required 2 units of blood about 15 years ago.
All I can say is thanks and enjoy your donut. You saved my life.
My illness was rather sudden onset.