I go with other recommendations on here... cut as many carbs as you can, don't wait for the GP or Diabetes nurse advice. Cit out as much bread, potatoes, rice, pasta, breakfast cereals, and anything made with either sugar or flour (or likely both!). Good things include Cheese, meat, fish, nuts, eggs, veg, fruit (in small quantities).
One thing to remember right now is that any carbs you ingest will very very quickly turn into glucose in your blood.
I wish you well.