What type of diabetes do you have? In my experience diabetes isn't usually sudden - it usually lingers a while before people get diagnosed, but the diagnosis seems sudden.
Getting an illness like this is like grief. You go through stages, such as anger and denial but you WILL get through this. We're here to listen when you need us to and give you all the help and support we can. Get as much information as you can about diabetes - ignorance really isn't bliss with this. If you look after yourself you can live a very normal life and you'll find that you are actually healthier than many of your friends and family!!