What would cause a severe craving for Oreo cookies?

I've had this unbeatable craving for oreos over the past 4 months. I don't know what to do. I've tried eating just a few, I've tried supplementing healthier options, even if I eat the entire box I still crave them. I went through 3 boxes one day. It's just like that's the only thing I want to eat. Everything else sounds too boring. Is there some kind of deficiency that would cause this? Or is there a good way to break the addiction? I've tried the whole not eating them for a long time thing, and it's just torture. And I end up breaking down and eating a ton of them after like 5 weeks. I can't beat it. Somebody please help me. It's making me gain weight, and I already have a self esteem problem.