I've not any experience of this myself but I can imagine how scared you must be. To give you something positive to read, I know of a lady (a friend of my mother's) who had her leg amputated a few years ago. She is not diabetic but she was terrified of coping, especially as she is practically blind too. I have to tell you this lady still leads a very full and active life and lives on her own. She is one very determined, gutsy lady and still edits the village magazine and has the sunniest of dispositions....oh and she is 96 years old!!!! I hope that inspires you a little.
Yes, one career has probably ended for you but hopefully another career will be waiting in the wings for you. Perhaps you'll find a hidden talent for writing or I.T. work....I bet there are hundreds of other jobs you'll still be able to tackle with pride and enthusiasm.
Sending you a big virtual hug and some positive vibes too. It won't make what you're facing go away but I hope it helps to know others do care.
All the best,
Choccie.