Aunt Duddie Can Have 2 grams of Sodium a Day

I need some help. I am on low carbs, low potassium and 2 grams of sodium a day. I know which foods I have to avoid and my potassium is limited to a yogurt a day. Well, I can have a banana but I am allergic to them. The part that puzzles me is the carbohydrate count. I don't know how many carbs I can have. Any suggestions? I need to lose 20 pounds.