Right that will be why your food shopping cost a fortunre, cause you bought weight watchers and slim fast. Slim fast is evil for the reasons I mentioned before, cause as soon as you reach your desired weight you will go back to how you ate before, and but it all back on with extra!
Do you actually cook at all, or is it not something you enjoy? do you tend to opt for food you can stick in the oven with minimal preperation?
Eating healthier you will feel the difference, by not having refined carbs your blood sugar will not be as erratic, so you wont be prone to mood swings, plus general things like better skin, hair nails etc are the most noticable. Not as lethargic is another noticable thing. You may also benefit from doing a two day detox to remove all the old toxins from your body before hand.
The main things to you do to help are to reduce saturated fat intake, alcohol, this is more fattening than sugar! less sugar salt, and food additives. So really weight watchers meals and slim fast wont do you any favors as its all artifical as well.
If you dislike cooking, but want to eat a bit better check out the Go Cook range from Asda, Ihave just started shopping there and the range is all really easy to do meals but all using normal ingredients, no additives and rubish.