If you transitioned from the Standard american diet ("real food") to raw fruit everyday, you are SURE to feel sick. Your body is addicted and used to cooked food, and/or enzyme depleted food. It is familiar with processing this over-processed stuff and not familiar with a sudden onslaught of super enzyme rich food that needs digestion in a completely different way. Your detox signs after three days merely illustrate how much you could potentially benefit from eating such a cleansing diet.
You become sick because eating raw food takes the digestive burden off your body, and suddenly your body is able to expel all the wastes and toxins it was holding in -- because it has energy (freed up from digestion) to put towards this.
Please try eating raw for over a week and see how you feel, to judge the benefits. Let your body get used to it.