I think that's still Bulimia...even though you're not doing it with an intent to make yourself skinnier, it seems like something is missing in your life that you feel you need to relieve your stress this way. If you continue this, it can only lead to problems with your health and increased stress. I suggest you talk to someone you're close to about what's going on in your life that is making you do this.
I don't know, it kind of sounds like a method of self-mutilation. Just like how cutting, burning and other forms of abuse give people a temporary sense of relief and control, maybe your form is purging. If your stress really has nothing to do with binging and weight control, then it doesn't sound like bulimia, but I'm no expert on that.