How can I stop these tendencies? Its haaaard?

I'm a former bulimic. Anorexic/bulimic..
In my earlier highschool years I was really bad.. I lost about 50 pounds.. (Granted, I needed to)
I'm healthy now, thin... but by taking care of myself.
But occasionally it still kinda returns. I'll feel guilty and do it.
It hasn't been regular. But I have like twice this month and I'd stopped for a couple years. And IRS really frustrating. I hate myself for it.
I'm not even worried. I know I'm thin. It's just an impulse. And I know its unhealthy and gross.
What's the best way to control my urges more?
How can I stop these tendencies? Its haaaard?
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