My blood sugar level was at 360 last week.?

My blood sugar level was at 360 last week with blurred vision and my doctor prescribed Fortamet HC 500mg once a day. The following week it was 325. She then suggested I take Fortamet twice a day and an insulin shot every morning. I have since then eliminated foods with any form of sugar, eat only baked meats, salads, cereal, steamed veggies, and fresh fruits. Although my vision has returned to normal, I don't think I'm doing enough. Any diabetics out there have any suggestions?