Sorry Toth, to hear about how Diabetes has complicated your life to the extent of losing your leg. I have battled diabetes for many years, and like many who have this illness live in worry about the complications that could happen.
The prosthetic is the best way to go. I know of some who just gave up, and surrendered into a wheel chair. I know that it's a shock to face the loss of your leg. I remember being in a hospital hallway, and seeing one of my collegues just after it had happened to him. But, he was a fighter, and today you wouldn't know that he walks with a prosthetic.
Keep a positive attitude. That is the best that you can do.