Hi Sam
What you have to remember is that this is so very very rare. It does happen but not often. It is hard to take in and I understand your fear completely. It is a different fear as I am not the one with diabetes but I fear for my child every day and night without fail, for the past 10 years since the day she was born (diagnosed aged 20 hours). You learn to live with it and whilst it is not ideal, you cope with the fear and it becomes a part of who you are.
You'll be ok Sam, you are doing so well at the moment, try and sleep and tomorrow is another day x