Originally Posted by
AoD
CBT is training the brain to alter thought patterns, you're talking about exposure therapy for desensitisation there, it's a bit different. Both are often used together, but they serve different purposes. For example, CBT is used to treat insomnia, by forcing the brain to re-learn proper sleep routines and thought patterns relating to sleep, it doesn't have anything to do with exposure and phobia treatment.
For emet CBT works as well, so does exposure therapy. CBT can help you to teach your brain to break the unhelpful thought patterns (to stop thinking vomiting is the most fearful thing in the world) while exposure therapy can help you to re-learn that the activities you avoid because you think they will make you vomit aren't likely to cause that.
Of course if you start the treatment by being convinced it won't help you, you're off to a bad start, because CBT requires a lot of self-work to change ingrained habits and thoughts. If you don't put in the effort (and you're not likely to if you already think it's futile) it won't work. You ARE too fixated on thinking it won't work, so you're setting yourself up for failure. Like I said, CBT will help you lessen fear of the outcome by learning that vomiting isn't scary and it isn't dangerous, while exposure therapy works to lessen your avoidance behaviors and learning that the risk of getting sick from those activities isn't that high.