Any experience with realizing you still angry when you thought you were over it? Thoughts on working through it and letting go?

I do mean other than the classics of Marcus Aurelius Et Al.

Also I realize that this is without enough content for analysis, but in the spirit of this being more of a tech support group, any one have the General issue of :

Probably some anger that I didn't know was still there, it affects my happiness, any ideas on tools /reading to help realize what the heck else I am angry with?