Hello.  I am so sorry that you are feeling pain so badly.   There is no time limit during which you should start to feel better.  In my experience it happens slowly and gradually but there is nothing wrong with it taking a long time unless it is starting to seriously interfere with your daily life.  I am no grief counsellor but would suggest that you read the section of this website headed Coping With Grief (type those words into the Enter Keywords box at the top of this screen).  Amongst other things it gives you to a link to the well-established Cruse Bereavement Care website who have helped many people.  I very much hope these may be of some use to you especially at Christmas which is such a difficult time for bereaved families.  My best wishes.