Info from Dr. Nick's office told me:
Choice: - 6 month diet plan with your doctor or - 4 month diet plan with a nutritionist
Mandatory: sleep test
Mandatory: EKG
Mandatory: psychologist visit
and something else that I forgot. If your doctor's closer than the nutritionist, may be a better deal, despite the extra wait. if you make other appts while doing the diet, earliest is 4 months.