For now, you could try picking healthier snacks. For example, instead of pretzels and cookies, try an apple or a banana.

Also, try a hot beverage, like coffee, tea, or hot cocoa. Sometimes that works for me. Oatmeal works great, too.

It doesn't solve the eating problem, but it'll slow down the weight gain. (It sounds like you can't really avoid the hunger side effect anyways.)