If it is true that you simply cannot stay away from these foods that you know will hurt you not only in all those calories and fat grams, but mentally as well, you aren't going to be able to stop cold turkey. I believe taking small steps and moderating is best at first, until you can reach a time when you can go without it for a stretch. Don't think of it as you'll never be able or "allowed" to eat Panda Express. You absolutely will, and when you are ready to eat there again, you'll be armed with more information about their healthier choices and other options to make your meal more manageable. Don't go from one extreme to the other. If you go to Panda Express tonight, maybe just exchanging the orange chicken for something else like their eggplant tofu or steamed veggies. Or replace the chow mien with white rice. A simple substitution can go a long way.
What helps for me when I am craving a food or one I love is being offered to me is to remember how great it feels to be thinner, even if I haven't lost a huge amount yet. When someone asks me if I want a cookie or something, I say, "No thanks, I like fitting into my old jeans much better." People always leave me alone after I say that.