Eating disorder and pregnant

For years I've struggled with anorexia and depression. Now that I'm pregnant, I'm scared to death to gain weight, even though I know it's for the benefit of the baby and it's not "just getting fat". Morning sickness has been my excuse to not eat the majority of the day, but I am getting about 1000 calories. How do I cope with the eating avoidance when the numbers on the scale going up makes me depressed? I haven't seen my OB or therapist about this yet, but I will in 2 weeks.