The worst problem with any anxiety or panic disorder is that the phobic person cannot tell his or her body to calm down once they experience the trigger.
With emetophobia, the "trigger" is either someone else vomiting, coming into contact with someone who's sick, hearing news of illnesses or feeling nauseous or "off" somehow. And the trouble with not being able to calm the body quickly is that the anxiety and panic tend to escalate very quickly into a full-blown panic attack. Panic attacks feel terrible and many phobics fear them. With emetophobia, the phobic person may fear panicking because they believe the panic attack in and of itself will make them vomit (it won't).
Phobics try to "tell themselves" to calm down but their positive self-talk doesn't work because for every ten times they say that to themselves their brains also register the negative thoughts of "Oh my God! I'm sick!" about a hundred times. The trick is to intercept the negative thought loop right at the beginning of the panic cycle.
In order to do that, phobics must become masters of relaxation. When someone tells you to "calm down" it's about as useful as them saying "play the piano" when they've never had a single lesson. It's impossible. However playing the piano is indeed possible - if you learn how, and you practice every day. The more you practice, the better you'll become at it until the day when you can play perfectly, even without music.
Practicing relaxation is simple with the proper tools. You need to find a recording to listen to that:
a) teaches you how to breathe properly for relaxation to become second nature, and
b) uses guided imagery to teach you to assess and relax each part of your body from head to toe.
If you can listen to the tapes once a day for at least 3 months, you will soon be able to automatically stop an anxiety or panic attack by simply taking one deep, slow breath.
For years I used some old cassette tapes that I bought from the Cancer Society that were very good, but their angle was healing of the body. Which is fine. But I couldn't find any that specifically targeted relaxing the whole digestive system and such. Also, as a Christian I never found any recordings that integrated the healing beliefs of Christ into the relaxation process. So I got together with a musician friend of mine and we both improvised together as the spirit led us and did three relaxation recordings.
Safe in the arms of Jesus