Anger stage of Grief

I wasn't sure I'd ever hit the anger stage of grief and so far I've kept it at bay. But as the days go on and I miss my dad more and more I find it creeping in. 

All the sudden I want my dad so bad I feel like throwing a full out two year old tantrum. Something like this...

I quickly (10 sec) pull my thoughts into check and tell myself angers not the way and a trantrum won't help. So I just cry and miss him extra hard for a bit. 

I worry I might be like a volcano and just explode one of these days. (I'm only human.) 

Is this normal? Anyone else felt this way? What helps you?