Hang in there. If she were anything like my father, then one thing your mother likely worried about was that you would feel this way when she was gone. The more positive you can be looking forward, the better she would have felt.
Here's a great story about Alexis Ohanian who had to endure that pain as well. It was really helpful for me to be able to relate to someone like that who I already highly respected. http://fourhourworkweek.com/2013/09/17/alexis-ohanian-reddit...
I'm very sorry for your loss.