What does it mean when i get heat flashes, light headed and nausea frequently?

I am a 14 year old girl and when this happens i get light headed first then really hot and last I throw up. This happens very often and every time I search it online it tells me my problem is menopause but i highly doubt that since that's not supposed to happen for another 40 to 50 years. If you could please help me i'd highly appreciate it. Please and Thank you:)