Where other Cancers flip-flop emotionally, you have physical highs and lows. Think of this as a biorhythm to which you need to pay close attention. When your energy's up, it's potent. Direct that strength to those things that really motivate you and make you happy. When you feel your energy waning, turn your attention to personal needs, in particular your health. This helps you avoid burnout during the more manic swings.
On a personal level, you are incredibly insightful, something that a birth number 7 accentuates geometrically. Your gut hunches are nearly as good as other people's facts, and can be trusted in a pinch. This could well be applied to positions like stock broker, where working with a combination of historical knowledge and instinct creates financial rewards. You are also very astute with people, which could lead to a career in psychology or related fields.
In relationships, it's absolutely vital that you trust the instincts that you so readily use professionally or for other people's benefit. You are easily hurt, very passionate and intense in love, and those nearly psychic flashes often keep you from unhealthy situations where you could lose yourself completely.
Gift idea: a holistic first-aid kit.