Eat as much fat and protein as you want until you get through carb flu. Screw calories and "proper amount" Eat as much as you want as often as you want.
Also, play around with the quality and timing of your carbs. Some do better with even carbs through the day, some do better with very few carbs in the morning meal and more at dinner. Go for the low GI bulky carbs. i.e. veggies, not fruit or chocolate
MTA: because it is rare I dont have more to say
"When I got too tired to run anymore I just pretended I wasnt tired and kept running anyway" - my daughter Age 7