I was going to say what xmdmom said - two different types of anorexia. There are also atypical eating disorders. For example, when I first got sick in my teens, I developed a fear of eating, because it was associated with the pain and diarrhoea I was getting. Whilst it's normal for people with digestive symptoms to dislike eating, I became overly phobic and avoided eating because of my fear of food and its effects on my digestion, not just because I was physically too sick to eat.
Because I had no body image issues, and knew I was too thin, I did not have anorexia nervosa, but the extent of my fear of food and the illogical way in which I dealt with it could be said to approach a disorder. I put my fear ahead of the risks that came from being underweight, and became a bit obsessive about eliminating foods if I had diarrhoea after eating them, when actually it was just coincidence that I'd had diarrhoea that day.
Now I don't have that phobia any more, but I still have no appetite, so I have anorexia (the loss of appetite kind), but no longer have disordered thoughts and behaviours about eating.
So the crucial things to figure out regarding anorexia nervosa are do you have a body image issue? (do you think you look fat when you're actually thin?) And do you want to lose so much weight than it would be detrimental to your health?
It's also worth considering that eating disorders may be on a scale, with clear disorders on one end, and healthy, normal eating on the other. For example, you may have some traits of an eating disorder, but not so many that you would meet official diagnostic criteria.
And the last thing I thought reading your post is I very much relate to having a bloated stomach. I'm underweight but my stomach looks out of proportion compared to the rest of me. Other people can see that my stomach is bloated, so for me my self image is not distorted. But if your bloating is something you feel rather than see - if you feel full and uncomfortable but it isn't obviously swollen - then you may see what others can't because the full feeling influences your self image. But if you don't feel bloated, and others tell you you don't look bloated, but you still see your stomach is swollen, then you may have a distorted self-image. Do you see the bloating as fat, or as something that makes you look unattractive? If so, that would probably be a trait of an eating disorder.
If it makes you feel any better, I really do have a bloated stomach, and am honestly not bothered by how it looks. Having Crohn's can make it hard to like your body, when it causes so much pain. So try not to get too hung up on what you look like - appreciate the things your body does well, and the resilience it puts up against this illness.
