If you are STARVING, eat! Focus on lean protein and fiber to get the most bang for your buck, calorically. They, along with healthy fat (mmm, avocado), take a long time for your body to break down, so can help keep you full for a long time. I don't mean to be unhelpful, but it sounds like you really didn't eat much yesterday (but great job with your self control!). They say that you should be eating at least 1200 calories each day, as an absolute minimum, to keep your body functioning well. But day 1 is hard, and you did a great job staying on track! Balance-- this has got to be sustainable :)
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