I'm so sorry to hear about your loss. I can relate completely. I just lost my grandmother in July while I was finishing and handing in my final paper for my MA. Just as I was getting into bed, just right now, before I read this post, I was thinking about how I felt ok but I felt like something was missing. I think, for me, I haven't really been able to deal with her loss.
I didn't really want to do much after my gramma died but I used all of the things I had to do to keep me going. I'm training for the Toronto breast cancer walk and I absolutely had to get the training in. I didn't want to but once I was out there that time gave me some clarity and peace. Like Mr. Silver said, maybe if you got on for a bit, you might feel like doing it again.
Be kind to yourself, grief is a strange response. It's so individual and doesn't really follow rules--let yourself grieve your way. I hope you can find some peace and eventually feel like riding again.
"Live, more than your neighbors. Unleash yourself upon the world and go places. Go now! Giggle. Know. Laugh. And bark the the moon like the wild dog that you are!" - Jon Blais