If you're having trouble keeping yourself to a healthy Diabetic diet, don't change things up. Have a chicken night, a fish night, a lentil burger night, etc. so that you know what's supposed to happen on Thursday and can prepare for it. If you have something different every night you'll still have variation, but having a schedule will make you feel much less stress and you won't cave into temptation.
A great before bed snack for a Diabetic is a glass of skim milk with two tablespoons of Whey protein added. This gives you something to keep your blood sugar levels stable over night, while the protein will help the milk digest and keep it from spiking your blood sugar too high while you sleep.
To reduce the sugar in your diet, try using light or low-fat products when you cook. These products aren't just lower in fat- they also contain less sugar and sodium. This is a great way to continue to use things like peanut butter, sour cream, and cheese in your cooking.