First, I am so sorry for your loss. I lost my husband of 25 years to cancer some 9 years ago, so I understand what you are feeling. In answer to your question, I would call the Social Services Department of your local or regional hospital. They can refer you to a hospice group or they may know of a hospital based support group.
Also, I remember the day I punched in a search for death and dying and was lucky to find a online support group early in my widowhood. It was a life saver. I was 46 years old and did not know one person my age that was widowed or had gone through a long caregiving experience alone. Please do a search for widows/widowers and I am sure you will find an online support group. The one I have been a member of since 1998, plans get togethers so you have the opportunity to actually meet some of the cyber family. I have been blessed with many loving friendships through my participation there. They also have message boards and chatrooms and someone is usually around 24/7.
I know that the most important finding of that group was to know I was not alone in my thoughts and feelings. That there were many others who validated my fears and my challenges over the early days. I do hope you can find some comfort wherever you choose to participate.
Please be sure to be kind to yourself at this time. I will be thinking about you and the others so new on this trail.