You are working very hard and not having a proper diet that can harm your body and can create health problem for you. As you told you are having 400-500 calories a day and exercising off 700-1000 calories a day that is not good. Here I am sending you some links from here you can choose your diet plan:
http://www.mensfitness.com/nutrition/what-to-eat/new-year-new-you-4-week-fat-burning-meal-plan
http://www.mensfitness.com/nutrition/what-to-eat/fat-to-fit-diet-plan
http://www.muscleandfitness.com/nutrition/meal-plans/28-days-lean-meal-plan
http://www.webmd.com/men/features/diet-plans-men
http://www.menshealth.com/mhlists/eating_to_burn_fat_and_lose_weight/
http://wellnesswithcoachcass.com/secret-obtaining-ideal-body/
http://www.menshealth.com/weight-loss/diet-advice-actually-works
http://www.askmen.com/sports/foodcourt/31
Hopefully these diet plans will help you. Otherwise PM me