h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

It's a terrible truism that time's a great healer but in the context of bereavement it's well worth remembering. The initial shock that gives way to anger that gives way to guilt that gives way to acute pain that gives way to a dull aching sense of loss eventually does fade into something bearable. Over time it's even possible to think about your lost friend/relative with a smile of remembrance for their life instead of shedding a tear for their death.
It took me probably the best part of 2 years to get to this point after 3 friends of mine were killed in an accident whereas others seemed to go through the whole process much more quickly. So take the time you need, don't feel you should have 'got over it' because everyone else around you has or feel guilty because you need longer. We're all different and our responses to bereavement are particularly personal.