I use a pump & had my first ever set failure the other week. I hit 32+ (too high for my meter to read) & it wasn't fun. I just drank loads of water, had an appropriate amount if insulin to bring me back down & checked BGs & ketones every 2 hours. If it hadn't have returned to normal after 4 hours, I might have been a little concerned, but a few hours of high BG isn't going to do any major harm, as long as you get it down again within the lifespan of the insulin you take to correct it. It takes 5-ish hours for insulin to finish working in me, so there would be no point panicking until after then. After all, I'd rather be comfortable at home while it comes back down than sitting in A&E for no real reason. We live & learn every day with this disease, it's a right royal pain & it's invisible which doesn't help, but we persevere. Hope all is well now.