I have no idea if I'm better or worse...but I am smaller

My calories have been on average, under 500 a day. Yesterday I went all the way to my limit of 700 but not over, and that was the worst day all week.
But I almost fainted in public, repeatedly. Oftentimes, when I'm feeling faint, I can sit down for a moment, get up slowly and continue on. But this time, I could not get back up without feeling in the immediate danger of fainting. The beautiful and sick thing about this was that while this was going on, because I was excited and had eaten nothing and had more physical exertion then normal, I knew I needed to eat but I had no desire to. The thought of food was repulsive.
Eventually I got to a food court and got vegetable and tofu stir fry, ate enough to feel steady, and had nothing else the whole day. And I felt lovely.
Also I fit into a size small skirt. I'm sure much of that has to do with vanity sizing, but, while by the numbers I am dancing around the underweight line (haven't weighed in a while though), I have huge hips. Great child-bearing hips. And all my weight is in my hips. Even if I weighed nothing, they would still be pretty wide, I can see wear the bones are and yeah, wide. So I can NEVER fit my stupid hips/butt/thighs into a small. I'm a small or extra small shirt size but medium or even at some places, a large in pants. But I fit into a SMALL. I could say I am, judging by clothes, officially small all over. I wouldn't believe it, but I could say it. Ah, I will push this from my mind, I'm sure it's vanity sizing. But still...