My friend's having hot flashes, headaches, stomache aches and vomiting. She also exhausted and her arthritis pain is acting up. There's a stomache bug going around but this is too big to be that in my opinion. She's a pediatric cardiac patient. She's not PMSing but we dont know what it could be. She just got back from the dentist about 2 days before all this started happening. She's only 16 so i can rule out menopause. what could it be?