You seem to be too stressed out with your symptoms. Feeling dizzy is a very common complain and it occurs to many people. There are "n" number of causes and the most common being:
2) Ear problem (Vertigo
3) Generalized weakness
You should get your blood hemoglobin done to rule out anaemia. Its very common among the adolescents and especially girls. There is no need to feel stressed. The doctor will order you some investigations and then treat the illness which appears on investigations.
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