When I wake up in the morning I get dizzy with palpitations and a pretty fast pulse and shortness of breath. Sometimes a headache and nausea along with it. Throughout the day I'm really weak and its gotten worse since it started a few months ago. I'm barely able to walk now and I get really really hot and then really cold for a long time and then back to a few minute period of really hot. I'll sometimes lose vision and go blind for a few seconds. Sometimes I'll be fine afterwards and other times I pass out. I'm 17 so I know I'm not menopausal yet. These episodes come in waves usually when i get up from lying down or sitting, but they come even while sitting or not doing anything too. Does anyone else get this or have any answers???