I've only just caught up with this thread but I hope you're both feeling better now MissA, your grandson from the sickness bug and you from your frightening experience 
It's awful to have a sickness bug, just when you've settled down to sleep again along comes another throwing up session but at least they only last for a few hours.
Sometimes there seems to be no rational explanation for things that happen particularly in the small hours when everything seems worse but we can start to process them when daytime comes. I hope you're getting over whatever it was 
You may not be religious but sometimes we can reach for a prayer which may be of comfort through habit or ritual and one which I thought of yesterday, coincidentally, which I have not said or thought of for years:
“Lighten our darkness, we beseech thee, O Lord, and by thy great mercy, defend us from all perils and dangers of this night.”