Anxiety or something else ?

Okay im a 14 year old female in 8 grade and i have been having problems with what i thought was motion sickness for the past 5 months. Now im starting to wonder if i have an anxiety disorder. Somedays I cant go to school i missed 4 weeks in a row because i was so sick to my stomach and just couldnt handle the crowd noise. But now I dont go out with my family to eat, And if they try and make me go i have a panic attack. After the math and reading TAKS test i recently took i felt so horrible and couldnt stop shaking. I noticed it was getting worse when my parents started fighting. im a shy person and dont talk much except to my friends. And school is fine so i dont really know what could be causing this :( Im afraid of throwing up if that makes a difference :P gosh i just hate it so much !! and im thinking im so afraid of getting sick that im making myself sick :P go figure.......