Josben, I'm very sorry for your loss.
I don't really know how you can stop feeling as you do, as everyne else says I think it's just a time thing.
My mum died 10 weeks ago, 8 days after my dd was born. I am actually feeling worse now than I was a few weeks ago as I think I was just in shock for a long time. I was unable to be with my family or go to the funeral as I am in NZ, she was in UK, I had an emergency CS and a serious infection afterwards and was told there was no way I should be flying for 24 hours.
She died in a car accident, so a complete shock, her car was hit at great speed by one driven by a 17 year old who was (allegedly) on his mobile phone.
Some days I feel very angry, guilty, shocked, horrified. Ohter days I try to think about what a great life she had and how lucky I was to have such a fantastic mum. I try to remind myself that the last thing she would want is me to be suffering - she would want me to be enjoying my lovely baby.
I'm sorry I have no real practical advice, I just wanted to let you know I really know what you are going through. Grief is a very lonely thing - I feel so alone, even though dh and friends try to support me.