Foods are made up of:
carbs (carbohydrates = all sugar and starch),
protein,
fats,
fiber, and
vitamins/minerals.
The carbs, proteins, and fats all contain calories, which your body burns to produce energy and warmth.
To lose weight, most people have to restrict the carbs and the fats. Adding a great deal of protein to your diet WITHOUT cutting back on other sources of calories is actually bad for you, because proteins create byproducts that are hard on your kidneys. Adding protein will not make you lose weight. You have to decrease your total intake of calories, and Snackwells have plenty of calories, mostly in the form of carbohydrates.
If you are taking in sugar, it's sugar no matter what the source (and our digestion also turns starch into sugars, just a little slower).
The only way I can lose weight or keep it off is to restrict carbohydrates, which includes all forms of sugar or starch. That means I have to count refined sugar, corn syrup, rice syrup, fruit sugars, etc., all grains, flour, corn, potatoes, etc. I also limit most forms of fats. Good quality butter, olive or nut oils, fish oil supplements for the omega fatty acids are the only oils I will deliberately choose in my diet.
The 84 grams of carbs you had in 7 cookies is more total carbohydrates than I can eat in two whole days and still maintain my weight. Of course, lots of physical activity, if you are capable of it, will burn calories, too, but since women burn only around 100 calories per mile when walking, you'd have to walk 8 miles to use up those Snackwell calories. (Then there's still all the other food you ate today….)
Apples are better than cookies because they have lots more vitamins and minerals and fiber along with the sugar. They are real food, while cookies are just tasty calories. But too much fruit sugar will plump you up, too. Fruit juice, especially, is a very concentrated source of sugar, with all the fiber removed.
Your husband sounds like he might be trying to undermine your diet. It's probably not conscious. He might be concerned that you will make him look fat or lazy if you succeed, or that you'll be too attractive to other men, or might feel to confident about yourself. There are dozens of possible reasons to try to keep another person from changing.
For your weight-loss efforts to work, you really will have to decide, for your own reasons, what your limits are. If you're not determined, any little temptation might overcome your resolve.