If you find yourself getting too tired Stu up your calories for a day or two and see if that perks you up.

Personally I always follow this rule

Calories for BW + 500 kcals for building size
Calories for BW - 500 kCals for loosing weight

This would put you around the 2734kcals a day, probably a decent meal off what Paul stated so as I said add a bit extra if you are tired.

If you do start to loose weight, be mindful that it isn't too quickly as you can guarantee that it won't all be fat you are loosing, muscle will disappear too if you starve yourself.

Paul.