This happened to my daughter once. She slept in late then when she woke up and came into the kitchen she collapsed in my arms. She couldn’t focus her eyes, talk, walk or anything. We immediately gave her the shot and she bounced back within a 1/2 hour. She had a slight touch of diarrhea the night before. SLIGHT! No dehydrating occured due to it. Must’ve beena stomach bug I guess. Scared me so much. Take care! Julia