Pheebs - Au Naturale

Yesterday, I broke my diet. I started out alright with fruit, almond butter and tofu, but it only got worse as the day progressed.
Finally, I had nonfat frozen yogurt, and buttered popcorn. I have been trying to stay vegan, and this did not happen. I felt so guilty, and stuffed my face when I got home with whole wheat pasta and nutritional yeast. I know I know, at least its healthy, but is anything really healthy when you stuff, and I mean stuff, yourself with it?
On the plus side, I had a good 45 minute run.

Today I started out with an organic whole foods apple with almond butter. I ran five miles (46 minutes). Then, I ate an orange. Later, I ate cheese pizza. Two slices. I legitimately binge ate when I got home, and not just the "I was emotional and stuffed myself", this was literally a binge. It was all healthy (in theory) and vegan, but my god, I can feel my bloated stomach turning. I then had some of Kayleigh's Diet Mountain Dew. I feel terrible.

I honestly can say this is one of the only times I've had a real binge, and not just a "I stuffed myself very quickly" episode. Why is this happening? I never had trouble becoming vegetarian, so why is being vegan so hard? I don't even like frozen yogurt or pizza.
Any insights? Sorry my blog has been so neglected, I just feel so horrible about myself right now and I don't think I could get through a post without breaking down. This is so pathetic that I am so upset over something so insignificant.