I've met people who are either "on" or "off" raw, where "on" means doing everything perfectly and "off" means eating cheeseburgers, fries and shakes- and it doesn't make any sense. You can choose to eat reasonably healthy when you are not eating all raw.
If you find yourself either "on" or "off" raw, consider where else in your life you set yourself up to fail by either being too extremist in your expectations, or by giving up at the first set-back.
Raw is defined by many people as being 75% or 80% raw. It is nice to eat homemade hot vegetable soup in cold weather, and you will naturally eat more raw foods like salads in hot weather. Trust your own body wisdom.
If you are suddenly craving unhealthy foods- consider that it has NOTHING to do with your food choices. Maybe you are going through a very stressful time, maybe even an emotional growth period. Instead of thinking about food- maybe you should think about how to be kind to yourself. Avoid temptations for unhealthy choices by shaking up your routine and adding in things that really work for you. That could be visiting a friend or getting some exercise. What Michael Beckwith calls a "dark night of the ego" is an opportunity for your soul's growth.