4) You have clearly have diabetes based on your elevated FBS, and probably should be on metformin. See the ADA's Standards of Medical Care in Diabetes 2012, where it says in the section on Therapy for type 2 diabetes – Recommendations "At the time of type 2 diabetes diagnosis, initiate metformin therapy along with lifestyle interventions, unless metformin is contraindicated. "
5) Cysts on adrenal glands usually are non-functioning, so probably your cyst was not influencing the glucose levels. However, an endocrinologist can assess and clarify if there's any concern about your adrenal situation now or previously.
6) You should request a consultation with an endocrinologist, not an obstetrician/gynecologist, for your diabetes and adrenal advice.
Hope this helps!