Anxiety and travel sickness?

A year or so I've had anxiety problems and panic attacks which seem agoraphobic and I'm on a cbt course ATM
Since my panic attacks have started I've also started getting travel sick on car and coach journeys more than an hour or so - nausea but no vomiting actually.
Next week I'm going away and ill have to go on a 1 1/2 hour coach trip non stop and I'm quite nervous about it (I'm quite emetophobic aswell)
If anyone has suggestions for medications or ways to stop anxiety related travel sickness I'd love to hear!
Thanks!!! :)