Hello and welcome,
I agree with the previous posters that the first thing you need to find out is the type of diabetes you have. If necessary visit another doctor. I find your doctors attitude quite bizarre. Without knowing the type no one can help you.
If you are type 2 I'm a low carb person but I agree with a previous poster that the most important thing is the effect that various food has on your levels. That will determine what you can safely eat. If you are type 1 the advice is a bit different.
You need to make sure the doctor is giving you the information you need to take care of your health. It is your body and you have a right to the information. Remember er- the doctor does not know your body as well as you- he/she is not as invested in your health as you are. He/she has no right to not give you the knowledge you need and almost certainly he/she doesn't have as much knowledge about diabetes as the people on this site
Good luck