Anxious,homesick,help?

My parents divorced when I was 8. I'm 14 now, and this morning I flew to New York to visit my Dad. I have horrible anxiety. I'm already seeing a councelor and I went to the doctor and they prescribed me Celexa , but they said it takes time to work. I'm homesick from being away from my mom ( its very very difficult. I cry) and then my anxiety is making me clench my teeth, jack up my breathing, get a sick feeling in my stomach,chest, and throat. Help?! I'm staying for 3 weeks so I'm really anxious