Diane,
I am so sorry for your loss..I lost my Mom and Grandma in a 4 month period. This was three years ago and I still miss them terribly. Give yourself time to grieve, your grief is personal and unique. I held a ceremony with my kids and grandkids at the end of each season during the first year thanking God (or whatever your belief system is) for helping us to get through the season without them and ask for strength to get through the next season. On the one year anniversay we wrote messages to them on balloons and let the balloons go. We have a candle for each of them and burn them on holidays, their birthdays,anniversary of their deaths. These rituals have finally started to be more of a celebration of their lives and telling favorite stories, in the beggining it was painful because the loss was so fresh. This helped us to grieve. whatever you do, there is no right or wrong way to grieve and you must progress at your own time, there is not a "magical" time period when you are over it. We are here for you if you need to vent. Wishing you peace.