Please be very careful. The artificial sugars are often carcinogenic. Carbohydrates are necessary for you as well. The trick to losing weight is a change in lifestyle, not just eating. It's good to eliminate most sugars, but be aware that fructose (fruit sugar) is just as much a sugar as cane sugar.
Here is a trick I learned: protein in the morning. That keeps your metabolism quite steady through the entire first half of the day. Whether its nuts or eggs or meat or whatever, but you should have it with some kind of carb for the start-up kick your body needs. I have a handful (small) of raw almonds and half a slice of my own oatmeal toast along with green tea for breakfast. But I also snack through the day, and carbs have to be part of it, but in small amounts. In addition, having some kind of carb, such as a little oatmeal, before bed, helps you sleep much more soundly and that sleep will make the next day ever so much better.
Again, though, please stay away from artificial sweeteners. What you need to do is stop your 'sweet tooth' altogether. I learned that due to diabetes. I was kicked by a horse when I was 21 and lost my spleen and half my pancreas. I did not become diabetic for many years after that (I am 65 now), but I have learned that you can basically kill your sweet tooth, so that one or two bites of something sweet is all you can tolerate. It's just 'too much.' That is a very healthy place to be.
Good for you on your weight loss, but please remember that whole grains are very good for you,, and brown rice is a whole grain. Potatoes are also very good for you, actually -- you just don't have to load them up with butter and such.