I'm a 16 year old girl. I get lightheaded a lot. one time, I was sitting on my couch and stood up. when I stood up, I got lightheaded. it had happened a lot so I thought I would be fine and I just stood still. my mom, brother, and step mom were all in the living room at the time. the next thing I remember is opening my eyes and looking at the floor while my mom asked me if I was okay. I answered her with, "what happened?" I turned over on my back to find that everyone huddled over me with a worried expression on their faces. I was really confused. they told me that i was standing still, got really stiff, and fell face first. i ended up going to the hospital. they told me it was a normal thing for kids my age and that i probably just stood up too fast. this was the only time ive actually fainted, but it might just be because now i hold onto something or sit back down when i get lightheaded. still, sometimes i feel like i get really close to passing out. this happened about a year and a half ago. i still get lightheaded quite frequently. sometimes when i stand up, sometimes when i stretch, and very rarely when im just sitting down. i also feel fatigued, very easily out of energy, and sort of like my body is weak sometimes. i know this happens to a lot of people, especially my age, but i just cant help but be worried that maybe something else is going on. please help. i need advice.