Me? Anorexic? No Way!

Hello. Here's just a brief background. I'm bipolar. I got fat on meds. I was put on Topamax to help with moods and to help loose the weight. I lost some weight. Then I started with Slimfast and lost more weight. A total of 55 pounds. I went from a size 14 to a size 5.
Now I am still on this diet and I still want to lose weight. I am so afraid to gain it back and I am excited to see just how far I can go with the weight loss. I still feel I need to lose more weight.
I went to see my pdoc and she didn't recognize me. I asked for more Topamax for my moods. She asked if I was Bulimic. She asked if I was done losing weight and she weighed me.
My therapist says I'm Anorexic and that's all we talk about in therapy anymore. She says I cannot lose anymore weight, even though right now I am at my healthy weight for my frame. We are arguing though. I say I'm medium frame, she says I'm large framed which makes me be underweight according to the chart.
Why are my doctor and therapist so concerned? No one in my family says anything about my weight?
They think I'm fine. In fact I think my husband wouldn't mind if I dropped a few more pounds.
I Keep track of everything I eat and I write down the amount of calories consumed. I don't drink my first slimfast shake until 1pm and then I usually have one small meal late in the evening. I pretty much starve myself during the week when my hubby's at work. It's become so easy to do that I don't realize that it's practically starvation. I do eat, just not much.
However, I do not exercise like most anorexics do. I'm afraid I may build muscle and my weight will go up on the scale.
Do I really have an eating disorder?

Nobody here can diagnose you, because most of us aren't doctors, and even those who are can't diagnose you over the Internet.

However, I would be concerned, too. While many anorexics exercise, often to excess, one doesn't have to exercise to be anorexic. You're not eating enough.

I don't know what you look like, nor do I know what qualifies one to be medium frame vs. large frame, but your therapist probably knows better than you do. You do seem rather obsessed about gaining weight and your diet, especially since you don't want to gain muscle--which is generally a healthy thing--because you'll gain pounds. It won't be fat pounds, though...although you need some fat on you as well.

I think your therapist has reason to be concerned.