Is my anxiety causing this? please answer:(?

Okay, so I have horrible anxiety ( im only 14) and I'm already seeing a councelor and I've gone to the doctor and they've diagnosed me with ADD and possibly OCD ( when I get anxious, I chew on peppermint gum, and its hard to stop) . I'm on ADD medication and its helping pretty good except for today...Today sucked bad. This morning, my Mom told me that she and my Aunt have to go to California tomorrow night for my Great grandfather , who is on life support at this moment. I don't know if that's the reason why I was sooo anxious today. (California is 2 states away from me) . I also had finals today, but I wasn't anxious about that. Today I felt SICK. I was and still am really really nauseous and I keep clenching my teeth and my breathing is off and my stomach just feels nasty. Im really close to my mom and aunt, because they have gone through what I am going through right now, so I don't know if I'm nervous about them being away from me . Can someone help me pinpoint the cause of my anxiety? And tell me how to get rid of the grueling nausea ?!