im bullemic myself.been doing that for years.
ive stopped doing it by using several methods
1)BMI.as long as its around 20,i felt better.it doesnt matter if you still perceive that your body is still fat/bloated(its a form of body dysmorphia,i guess).just drill it into your mind that BMI=20 is good.
2)calculate your calories intake.i have this app in my phone where i can easily input the amount of stuff that you ate and they calculated the calories just like that.
3)eat foods with high fibre content.oats,legumes,fruits.those things makes your stomach feel full for quite a long period of time.plus,theyre good for you
4)exercise,exercise,exercise
i dont know about you,but my tendency to vomit back the food I ate stems from the guilt I felt for eating and the way I view my body.
so,if I ate healthy,exercise and controls my calory intake,that feeling of guilt and my anxiety that i overate will lessen.
its not an easy road.it takes months or years to suppress this desire/compulsion,but,its worth it.
i know you can do it too,buddy!