I would do what your doctor says. I do not think it will be a good idea to buy something not prescribed. Your post meal rise is quite normal and as long as you are not ill, it will come down. I think if you were to take anything else you would have some major crashes around 3 am - which is when our blood sugar levels are lowest, naturally. I have come to realise that a slight rise in blood sugar levels is normal after a meal, particularly breakfast, but by lunch time it will have come down.
I wish you well.