200 to 87 in an hour! Definitely nerve-wracking, but you're doing a great job hanging in there. 4 days feels like forever when things are scary, but you'll both make it until your son's appointment on Thursday. I'm sure you already know this, but there's always an endo on call 24/7 in the event things get crazier than they already are. I wouldn't hesitate to call the on-call endo if you need advice right away. Just keep doing what you're doing; everything will settle down again (as much as things "settle down" with T1D!) once you get to the bottom of things! Thanks for keeping us posted, and I hope Thursday comes quickly for you.