I'm not a doctor, but it sounds like you're experiencing some concerning symptoms. Getting up too quickly can sometimes cause a brief sensation of lightheadedness or dizziness, but if you're having consistent headaches and pain, it's important to talk to an adult about it. They can help you decide if you should see a doctor.
Low iron can definitely lead to fatigue and other health issues, so mentioning your concerns about low iron could also be helpful during your appointment. Make sure to keep track of your symptoms and when they happen, as this information might assist the healthcare provider in figuring out what's going on. Remember, it's important to take care of your health!