Hi,
It's just my opinion, but if you are feeling that going to work will be too difficult for you, then don't go. If you feel up to it, then you could possibly visit with a friend or a
relative, who understands what you are going through.
In the first few months especially, I would journal, sending my mom letters of things I wanted to say. I really found this helpful. I also would buy her a gift, such as a flower that I could plant to remember her by.
I didn't seem to feel better by visiting her gravesite, but if this is something you would like to do, that is an option too.
I feel for you. I remember just how painful this can be. Please know that we are here to listen.