I Have Fainted Before

This happens to me a lot, one of the more recent times was when I was at the hospital when my grandad was ill. The nurse came out and told us that it was cancer and a very aggressive form, my grandad had two weeks left to live. Suddenly everything started to go black, and I started to get tunnel vision. I tried to steady myself on a desk because I was shaking uncontrollably. It was all too overwhelming and I passed out then. After a while I awoke with a doctor putting ice around my head neck and chest. He was asking me if I was all right but I felt numb and quite guilty for taking the attention away from my grandad when he clearly needed it more than me.