Oh hunny, I so feel your pain.

believe me I really do.
No one knows you better than you know yourself and what works for you, And I can understand your fear because it appears from what you've said that you have a history of being able to lose a significant amount of weight quickly then fall into a trap of gaining it back. For what ever reason, that has been your reality to date. No wonder you are scared! Xx
I want you to ask yourself these questions.
Why am I on duromine ? Is it to lose weight for my wedding or is it for long term?
If it's for long term then how are you going to break the cycle of losing then gaining it back?
Is an answer to that to change your eating habbits? Portion control? Binge eating? What's your poison?
Do you think what you are eating is sensible if you are truely honest with yourself? Do you think you will be able to keep eating like this when you stop Duromine? If you don't think you will continue being able to eat like this long term then make those changes NOW!!!
By making yourself eat something even when your not hungry doesnt mean you have to have a big meal or fatty food or crap. Look at all the beautiful celebrities out there who share their diets. They dont have just 2 small pears for lunch! They have lots of little meals to keep their metabolism fast so that their bodies are constantly burning fuel instead of slowing down.
When people say they snack on nuts, it doesnt mean a hand full of salty fatty peanuts. It means 6 raw almonds. When people say they have an afternoon snack, it doesnt mean they have a can of coke and a donut. It means they have a carrot or apple.
You have to STOP thinking that eating will start bad habbits again. Eating the wrong food will start those habbits. Over eatting will start those habbits. Bordom eating will start those habits. Eating food that will sustain your body and give it the nutrients it needs is a good habbit. Don't substitute one bad eating habbit for another sweatheart by not eating.
Remember, you are taking a prescription medication that fools your mind into thinking your not hungry. Don't confuse that with your body no longer requires sustenance.
I've probably writen too much here and you'll go cross eyed just trying to read it lol but if you ever want me to rant on more just let me know

Xx