Been a little dizzy (48 hrs) even when standing up i feel like i'm rocking. did throw up, but my head is spinning. drink a lot of water. why's it hap?

Many causes: The many causes include migraines, hypotension, BPPV, Meniere's, vestibular neuronitis, labyrinthitis, medications, tumor, stroke, pregnancy, hypoglycemia, endocrine condition, anxiety, & depression. In your case, iron deficiency anemia is another possible cause. You should go to the ER if the symptoms persist and also see a neurologist. http://www.nlm.nih.gov/medlineplus/dizzinessandvertigo.html