Do professionals take atypical anorexia just as seriously as anorexia?

It's been a big wall in my recovery attempts because I'll be getting mental help in a month or so and I keep postponing actually stopping >!restriction!< because >!I'm just on the edge of underweight bmi for my age, gender and height. Still under 18 bmi but on the edge for my parameters nontheless.!<

!If I start properly eating now, I will for sure gain weight and won't be underweight anymore- in fact, I'm pretty sure I'm not anymore and am just at the end of a healthy bmi. So I don't "qualify" for anorexia.!< I don't mean to "promote ed" or anything, they're just genuinely my thoughts.

I'm scared I won't be taken seriously.