One thing I have seen others do with some success is to sit down quietly and write a letter to the departed person.
Telling them how you feel, reminding them of the times you had and your strongest memories of them etc. What you plan to do now, and acknowledge that your life will go on. Take some time over it, and it helps you to get your feelings sorted out and organised. Keep at it and don't worry if some of the ink ends up running a little.
Sometimes a piss up with the rest of the boys can leave you feeling hungover and more guilty that you have buried the grief further.
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