Fur shots happen. simply note that on your spreadsheet.
You never want to give another insulin shot, as you can never be sure how much of the insulin may have gotten into your cat Buddy.
Eventually, you will need to learn to shot those blue numbers at pre-shot. But tonight is not the night.
Get a good night's sleep, and pick it back up in the morning.
At least now, you have discussed things and thought over your options. So next time, you'll have a better handle on what you want to do.