I'm so sorry to hear about your other baby and understand why that would scare you. I had the same thing happen a couple years ago, so I am very skittish too. That's why I shot a half dose for Lucian, I was home, but had been up almost all night and knew I would be asleep for several hrs and his numbers were really wonky at the time.
Now, I would shoot a lesser dose, but maybe 75% instead of 50%, just because he went so high afterwards. But you never know until afterwards and you have to do what you think is safest for your kitty.
Big Hugz! :YMHUG: