sorry for your loss. It will definitely take some time for the hurt to pass, and start living life again. It will also take time adjusting to things, and learning how to cope.
This is all what we called life. People come and go for many reasons. Some of which we don't have answers to. But remain positive, and find things to do to keep busy. Don't sit home and dwell on things, it won't do you any good!
I'm sure somewhere in your heart, you have youth to dig up and take advantage of while your still here on earth! Grab a coworker, friend, brother, son-in-law, etc. and go do something!!! see a baseball game, football game, bowling, car show, etc.
Not sure if you have a beach/lake nearby, but go there alone if you want and just sit and think. It will help. Plus its a change of scenery. I know all this is easier said than done, but dont stop living your life! Life's too short - be happy, eventually, learn to let go- and move on with life. You'll feel better and happier once you get out there and meet new people by doing new things.
Just go for it, what do you have to lose?!!!