I am sorry for Your loss.
What we are dealing with in reality, when someone passes away, is our own attachment to that person - which is a form of egoism - and that amounts to psychic pain. This is an emotional energy stored in the body. Unless that energy is freed one will be suffering. Most people runaway from those feelings into doing something - they just prolong suffering. So, the quickest way to get rid of it, is to give it TOTAL attention, watch it, feel it, stay with that feeling as long as possible. Do not let yourself go into thinking about that lost person to often (it will add to that stored painful energy), do not scold yourself if it happens, just bring yourself back to JUST watching, observing your body - where you feel that energy, felling it. If you at some moment You do not have that felling and You are ready to work with it, to totally remove it, look at the picture or bring memories of that person to NOW, and those hidden feelings will appear. Allow yourself to feel it. You may say something like that: “ I welcome all the feelings, emotions, connected with (fill in the name of that person). Repeat it many times. Be ready that it may not be pleasant, as some places in the body may get really unconformable, even painful. This is NORMAL. That pain, or feeling, may move to different parts of the body, or that felling will flower - it will show itself to you in other places. Usually it runs from the head and encompasses whole body. Do not be afraid. Just be with it, observe it .... and watch is dissipate. At some point, it may feel like a balloon that is punctured - the pressure inside is getting less and less. It may not be obvious at the first try ... but in time You will notice how it works. Just be patient. This method can be applied to any feeling. Good luck.
Topic: Dealing with death of a loved one