Help! Tuesday I meet with Nutritionist ?

My Primary Dr. left me a message yesterday in regards to Revision Surgery on my phone that to cancel the lab test and appointment with psychologist, she spoke with the Bariactric Clinic and they agreed for me to have a consultation with a Nutritionest!! What questions and what do I have to meet with her for? for Revison??? my body mass is 41 and she said it is not enough???? I am not heavy enough??? but I am 30lbs. from my original weight back in 1988 when I had my Gastric bypass??? HELP? nervous..... Joanna