I started Couch to 5K in February. I ran a 5K in March (walked/ran) but had a lot of trouble breathing, bad shin splints and some sort of quad injury. I took a couple of weeks off to reassess if I wanted to run, and decided to cut back on my mileage until my body was used to it. I started doing a 2 mile circuit, 2 days a week, gradually running more and more each time. I ran the whole 2 miles last week, and have my second 5K next Sunday.
The program was great as a start, but also feel free to repeat days or weeks if it isn't going well. Everyone's body is different.
What is your eating like now? I don't eat back running calories, since I only burn 200/300 per session. I just stick to the calorie range I normally eat at.
It's about commitment, not motivation.