My mother and I had a very deep bond most of my life. She passed away when I was 25 (I'm 28 now and she was 65) and it was very hard to deal with, I'm even coming to tears as I type this because I miss her so much. All she ever wanted in the world was for me to succeed and live an amazing life. I moved 13 hours away knowing she could easily pass in the coming months /years. I even missed saying a final goodbye to her. By the time I got to the nursing home she was already in the final stages of death and all I could do was sit and talk to her in hopes she knew I was there. The last call we ever had, she dropped her phone and I was never able to say "I love you". Enough with my story, on to my suggestions for you.
What keeps me going... One, I know from the bottom of my heart there were never any unspoken words between us. She knew me more than anyone in the world; she was my best friend. The second thing is I continue everyday striving to make sure I succeed in life and live an amazing life. I know, if it's only in memory, she is here with me and I don't want her to ever worry about me making it in the world. As much as I wish I could hear her voice one last time I know I can't. As much as I wish I could one day show her my beautiful children... I can't. It's not easy, and anyone who tells you it is is just trying to make you feel better.
In short your mother lives on in your heart and memories. The relationship you formed with her is unbreakable and timeless. And if you're lucky you will have a chance to see her again in your dreams and you will cherish those memories as well.
Sorry for the rambling but I hope even a little of this has helped.