I have found that those who have expected me "to be over it by now" have never lost anybody signicant. I don't mean that to sound rude to them but they have only experienced grief from a distance as it were.
My mum died in an accident whilst on holiday just over 2 years ago and I am still struggling to accept. We used to talk at least once every day and she really was my best friend.
There are times when I feel on more of an even keel but life events such as holidays, Christmas, dc going back to school after holidays etc will trigger my pain. My DD has just moved up to secondary school and that has hit me hard.
For the first year at least, it seemed as though the shine and light had disappeared from life. I went through the motions but nothing was exciting. I was also very tired as had to work so hard to care for dc and ensure they were ok.
My grief seems to come out as a physical pain and I get convinced that my heart is going to stop.
Counselling helped me last year, not grief counselling as such more generalised but it gave me space to organise my thoughts and plan what I can do.
I also found that talking to my lovely dh, family and friends has helped and I am open about how I feel and don't hide it away. I have one particular friend who I ring now whenever I would have rung mum, to share something dc have done, talk about gardening etc and that has helped to close to chasm.
I am sorry for your loss.