Hi, I Am A Mother Of A 17 Year Old

Hi, I am a mother of a 17 year old who has suddenly been feeling faint sometimes. She said before it happens she has pressure/throbbing at her eyes and her hearing "goes down." This is only recent and has had similar feelings when getting up from a seated position, but this is not the same she says. She said she also gets dizzy if she moves her head/eyes too fast. She was so concerned when driving recently that she moved over to the slow lanes on the freeway to exit