Keep your eyes focused on your actual goals and current abilities, not living in what you used to do. It sounds like you were eating like crap and training mostly like crap (no offense), so simply getting those two issues in order again should get you back on track closer to where you were.
Definitely a good idea.
How much what you can gain - muscle, bodyweight, strength? In any case, two weeks isn't enough time to really see any significant changes.
What is your exact goal right now - build back muscle, drop fat, (re)gain strength? That's going to influence how you should arrange your nutrition. Very generally speaking, something like the 100g Carb Cure could be a place to start, adjusting the total calories depending on your goals.
You can't physically, like you get full on low calories, or you can't schedule-wise, like you don't have much time to eat during the day?
Nothing necessarily "wrong" with a ginormous bacon and egg omelette depending what else you eat that day.