anger is something that is normal to feel in grief - anger at your loss, anger at yourself at some point which often comes out as guilt - this whole what if had said or done something differently anger at others - those who still have their dad - those who dont understand what you are going through and expect you to be back to your old self after the funeral - those who say the wrong thing or use standard platitudes and those who pretend they have not seen you, cross the street and say nothing at all and at some point maybe even anger at your dad for leaving.I lost my husband and found i turned anger in on myself it is something i have always done - but years later i found myself walking up a hill shaking with anger at something a neighbour had done to my garden and then realising it was the anger at my loss that was behind it - he would have stood up to the neighbour - demanded compensation - and anger at myself for being to weak to do it myself.
Writing helps and writing here where others have experienced grief and all the things it can do too us helps even more - and as i discovered walking up a hill at speed gets rid of the boiling over anger before you loose your temper with people and say things you may regret later.