I fight health anxiety a lot, too, and travel is rough to combine it with. Does your trip require that you drive or fly? If I am flying, I remind myself that there are lots of people on the plane who could help me if I start having a health emergency. If I'm driving, I think about
the route and note that almost anywhere I could drive (in the eastern US), there's a hospital within 30 minutes. I had to call 911 from the side of the highway one time, so I know that they are capable of handling that, and it makes me feel safer now. At the destination, I usually try to get an idea of where the nearest ER is, in case I feel I need it.
Sadly, all of these aren't really coping mechanisms, but seem more like they're enabling my HA. But we do the best we can, and sometimes our best is to plan ahead for that "horrible disaster" we're convinced will happen to us, while also knowing that it never does. Even though I do make all these sorts of plans ahead, I've never had to put them into practice, so I guess that's a good sign.
Good luck to you.
Co-Moderator, Anxiety and Panic Forum
DX: Anxiety, Depression, LPR (acid reflux)
Meds: Paxil, Nexium, Zantac