I agree, ditch the tortilla for a week or so. And I would advise foregoing any diet soda or anything with artificial sweetener. Cruise around here for a while, I think you would find that, besides the many harmful things about those chemicals, that they cause your body to "hold on" to the fat or gain weight. Maybe it doesn't work that way in all people, but it might for you. I know you will miss the flavor but make iced herbal teas or squeeze lemon in your water, etc. Adn you should exercise everyday to help kick your body into ketosis. And don't eat after 8 pm.
Try these things for at least a week, see if that helps.