I'm on metformin (also known as glucophage). One 500mg tablet, twice a day.
Has he given (or suggested you get) a blood sugar test kit? I have one. Simple enough to use (and not painful). I seldom bother with it these days, but whenever I do, the sugar levels are well within acceptable limits.
Long term high blood sugar levels can affect the retina - hence the eye doctor. I have my retinas checked every twelve months.
Excessive eating, or eating the wrong foods, can raise the blood sugar level. Hence the dietician.
Trust me on this, Albert: If you follow the doctor's suggestions, Type 2 diabetes is not a death sentence.