Please help! Could I have altitude sickness?

I live in Vancouver, Washigton which is at about 500 feet above sea level and I recently flew to Eagle Mountain, Utah which I believe is at about 2000-3000 feet above sea level. Since I got here I've felt terrible. I've had trouble sleeping (waking up in the night, sleeping in and having trouble falling asleep) I've had a non stop headache, I've been nauseus, I almost threw up, I've had diarrhea, I'm tired all the time, my throat is really sore, I don't wanna eat and I'm really dizzy. I've never had altitude sickness before so I don't know if I have it or not... If I do, what are some ways to help it? When will it go away? I'll be here for another week...