You're getting some awful advice about sticking to a schedule, but I'm glad you came to this thread with the idea that a scheduled diet was something to work away from. Keep in mind that since running seems to attract obsessive types, any question here is going to get answered by at least a few people who are way more obsessive than you'll ever be. These people, in their own obsession, tend to project an even HIGHER level obsession on elite athletes. Keep in mind that Galen Rupp-the poster child for the obsessive, detail-oriented, no-stone-unturned athlete-had Taco Bell after a late-night race because it was the only place still open and he needed to eat.
Don't eat with rules- eat with guidelines. Guidelines are good suggestions to follow; rules are either obeyed or violated. Diet isn't something so important as to be governed by dictum.
Before anyone jumps on me about how important diet is, I don't say diet was UNimportant. It just isn't so crucial as to necessitate harsh, complicated rules. It should follow common guidelines- eat vegetables (try new ones- maybe you don't like onions and romaine lettuce, but enjoy kale and red peppers or parsnips or beets). Don't stuff yourself. Don't eat a ton of processed crap (a good guideline is to minimize food that comes in a box). Eat when you're hungry, and try to notice patterns (hmm, I feel all cranky at 3:30 if I skip the apple and peanut butter I usually have AROUND 3).
My "usual" day of eating when I'm healthy and fit (coming back from an injury right now, so I'm eating much less):
Morning- Cup or two of coffee (black, no sugar- this is a matter of taste, not a health decision). Two eggs, three pieces of bacon, 2 pieces wheat toast with a little butter (if I'm up early enough to run then cook) or two pieces wheat toast with peanut butter (if I slept in)
Lunch- burrito or leftovers from dinner
Afternoon- another cup of coffee, maybe a banana or a Snickers or something
Evening- main run of the day
Post-run- dinner, which is my big meal of the day. Nothing fancy here, just stuff I grew up eating (I find cooking relaxing). Standard template is meat, a green vegetable, and a carb. Examples- pork chop with breadcrumbs in the oven, as much steamed kale or spinach as I can fit on my plate, a baked potato; hash browns with green and red peppers and onions with a good piece of very rare steak; various soups and stews when I end up with 8 bags of half a serving of frozen vegetables each, etc. Sometimes my roommate and I go halfs on groceries, other times I just cook for myself and eat the leftovers the next day. I'm big on doing things like roasting a chicken, then turning the bird into soup a few days later. Dinner also includes at least 2 beers or, if it's in the house, a large glass of red wine. I live with three of my best friends and we entertain a lot, so the wine is more of a consequence of that than any sort of wizardry regarding the tannins or something.
I do try to buy stuff as unprocessed as possible, which means spending a little more money. It's not a perfect diet- oftentimes on weekends I'll get lazy and heat up a frozen pizza or something. On the other hand, I eat a lot of vegetables, a good amount of fruit, and never feel guilt, shame, or anxiety about what I eat. I've been told that the 2-3 beers a night I drink are too many, but I find the beer much easier to do without than the morning coffee!
I think the most important thing is to try to take a longer view of food. By that I mean I don't get too bent out of shape when my roommates and I order wings and fries during a Patriots game or something, because I know of the 21 meals and 5-6 mid-sized snacks I have during the week, only one or two of them would be so-called "junk food." I think the fact that my eating habits never cause me worry is of more benefit to my attitude and training than being a ball of anxiety with a perfect diet. Doubtless, this attitude will draw fire. It is what it is.
Good luck; I'm glad you're seeing someone about this to try to cultivate less rigidity.