Firstly, Mrs. s and I both extend our condolences for your loss. There is a reason they are called 'Significant Others', and to loose him, especially unexpectedly, is to cut out part of your soul.
Secondly, it's OK to grieve - to cry or to want to be left alone with your thoughts. Hopefully, your friends are not the type to tell you to 'get over it' or 'buck up', etc. That is about the least helpful thing they could do.
Thirdly, rest assured that your life will go on. Changed, to be sure, but you will continue. You will go through many confusing feelings - hurt, sadness, abandonment, even anger. That's all right, perfectly normal as a matter of fact. Don't feel guilty about any of those feelings; eventually you will come to accept what happened and will have the strength to build from that point on. You may want to hook up with a minister or councilor to help you over the rough spots and suggest coping strategies.
You may want to contact your county Social Services agency as soon as possible to see about finding a place to live. Being on SS/D or SS/I and without a permanent home might give you a higher priority in finding housing. May not be the greatest of places, but it would be yours.
And finally, don't be afraid to use the forum for moral support. A lot of folks here have been through some pretty rough times, and are more than willing to lend a virtual hand to someone going through their very own "TEOTWAWKI".
Good luck and keep us posted,
soupbone