Oh Alan,
I am so sorry. Di was such a sweet, wonderful woman. God bless and comfort you. I know you are still in shock right now. When the grief gets too bad you can find help and support from others who know what you're going through at a local church or online with a Griefshare.org group. It's once a week group grief counselling for 13 weeks. All you pay for is the workbook.
Hugs and prayers.