Find another way to cope with the anxiety of feeling the need to purge. Watch a show, talk to a friend, acknowledge the fact that it is a cycle that won't ever end if you continue "feeding" into the desire.
I never really did. I eat healthy, try to do things I love and if I feel the need to I come here. I don't think anyone can fully recover, even after years people still have bad days. When one asks me how to stop it, I tell them never to start. But I quit binging/purging very fast. There was this moment, when I saw in the mirror and said "stop". Like a hundred times at least. I forbid myself to hate my body. I quit a unhealthy relationship, I quit being unhappy and the disease quit itself whilst I was busy helping myself. One has to reach a breaking point, to see that there is only one way to achieve actual help. Yourself. I did it and when I think of this time in bad moments I think of this point where I was so destroyed, no one but me could pick me up and repair me.
It's not simple to stop something that you've been doing for so long, it can be very hard at times, but you have to remember that when you're doing things like this it's a step back in the direction you don't want to go, a step back into leading the path of your old ways, rather than breaking free. Before you start to purge you have to think to yourself "Is what I am doing really worth it, or am I simply hurting myself, and others around me?" That has helped me when I start to do something that can harm me.
Understandably, getting in a habit of something like purging is very hard to break. I've been there. The best thing I can tell you is when you get the thoughts of needing to purge, no matter how strong, remember that you are doing this to better yourself, and live a long, healthy, successful life that purging will not allow you to do. Always strive for greatness. You may experience bumps in the roads, we all do. This is for YOUR health, YOUR life.