So I am trying to figure out if what happened to me was a panic attack or something else.

I recently travelled overseas for about a week with my parents and when we were on the bus that was taking us from the airport to our hotel I started feeling really anxious and felt like something bad was going to happen. The fact that I was far from home made me worry about the "impending doom" even more. I started feeling all hot and sweaty and sick and like I couldn't breath. Then all of a sudden I threw up. It seemed to come out of nowhere. Thankfully no one other than my parents saw me get sick but I was still quite ashamed / disgusted. After I threw up all my physical symptoms went away.

What I am trying to figure out is if I was anxious because I felt sick or I felt sick because I was anxious... if that makes sense! Is it common to vomit during a panic attack? I don't think it was motion sickness or anything because I have never got motion sickness in my life and I have had two less severe "panic" attacks (still not 100% if they were panic attacks or not) prior to this that didn't occur whilst in a vehicle. Any help would be much appreciated!