Diet for Pre-Diabetes and Hypothyroidism?

I have recently been seeing a reproductive endocrinologist for fertility issues. Through testing he has found that I have PCOS (which I have known for years), I am pre-diabetic, AND I have hypothyroidism. I am going on Metformin, which I have been on before, and Synthroid. I am going to be meeting with a nutritionist in a few weeks to arrange a proper diet that meets the restrictions of my pre-diabetes as well as my hypothyroidism.

I’m just wondering if anyone else with both conditions has met with a nutritionist. If so, what was the diet like? What types of foods (besides the obvious white breads, potatoes, starches) were you told to avoid? What types of foods did you learn were beneficial for both conditions? I would like to know so I can start getting myself healthy now rather than waiting two more weeks and eating potentially dangerous foods.