www.skinnytaste.com - no bake cheesecake - seriously delicious - I make it all the time and instead of pouring it into a low fat crust, I spoon it into individual servings and top with graham cracker crumbs and sliced fresh strawberries. I like to sprinkle bran buds on top too for extra crunch. I've even halved the recipe and made less, and, personally, after the first time I made it I found it so sweet that I eliminated the 1/4 cup of sugar.
There are plenty recipes for sweets at skinnytaste.com
If you love desserts, you need to find lower fat, lower sugar, thus lower calorie versions and if you love to bake you should enjoy taking regular items and turning them into something healthier.
Start learning to make substitutions. You don't even have to use artificial sweeteners b/c you can use less amounts of real sugar, or substitutes like bananas, prunes, applesauce, and spices. Cinnamon adds sweetness, for instance.
As to the junk food calories - if you consume 1200 daily science will tell you that it shouldn't make a difference to your weight loss efforts - a calorie is a calorie is a calorie. I try to embrace this data. However, 1200 calories of junk is going to make you less healthier, and may make you feel horrible as opposed to a balanced diet of the same amount of calories.
If all else fails, try to tame your sweet tooth for junky sugary fatty foods. I know eating an apple pales in comparison to the cheesecake you're craving, but you may be able to deal with not having sweet treats 5 days out of 7, knowing that a treat is coming --- and make that treat a healthier version...there definitely are tricks to doing it.
Good luck.