How do others deal with bereavement?

My Gran died recently and I’m going to the funeral tomorrow. The problem is I’m not exactly speaking to my mum whose mum it was that died. We had a huge argument 2 months ago and haven’t spoken since. I’m not sure how I feel towards her. Don’t get me wrong, I loved my Gran but I don’t think it’s properly sank in yet. Should I maybe talk to a bereavement councillor?
Thing is, my Dad died 8 years ago and I guess I blame her for getting divorced and moving me miles away from him. I was only 11 at the time, new school, no friends and no self-esteem. Now I’m 28 and on meds for depression. It’s hard to make sense of things sometimes, when you’re already feeling rotten.