Bouncing from diet to diet can be a problem in itself. No plan will work unless you really work that plan. You need to be able to make changes in your life that you can live with and will stick to the rest of your life or your will be on the diet train forever. Frozen dinners a notoriously know for their sodium content. If you eat a non processed breakfast and lunch, a frozen dinner each night shouldn't inhibit your weight loss. You must keep track of what you are eating though. It's so easy to eat too much. If you don't like keeping track of calories or points, then maybe atkins or SB would be a better fit for you. No matter which plan you do, you need to stick with it. Great job on getting in some exercise. Take baby steps if you need to. Good luck!