Are you exercising regularly too? When I went vegetarian and then vegan, I was into running every morning. I noticed an increase in endurance with each change. When going veg the first time, I found I didn't get as winded running up hills. This stamina boost encouraged me to get into distance running. A year after going vegan I was doing 10-14 mile runs along the beach. Eventually I did a marathon.
When I went vegan, I was following the Fit for Life diet (from the book of the same name). This meant eating fresh fruit until noon each day and consuming 80% water-rich foods (many of them raw). For dinner I'd often have stir-fry or pasta with veggies. As I strayed from this water-rich diet and added more concentrated foods, I didn't feel as energetic.
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