I left my job to be a stay at home dad and I am very angry with my previous employer. How do I deal with my anger?

Six weeks ago, I left my job of nine years in the financial service industry to be a stay at home dad. My wife has been with her job for at least 20 years and it made sense for her to stay in her job and for me to leave mine. I also quite happy being a stay at home dad. I am grateful for the opportunity to do this and would not trade it for the world! Yet, I harbor anger toward my previous employer. The position itself was a client service position. We dealt with a myriad of people, or as a former VP said "we serve many idols," and we were on the low end of the totem poll. Everything was dumped on us. Our bosses told us to just deal and not take everything so personally. Internally, if someone made a mistake and did not have to face the client, we had to face the client and took the blame and a mountain of abuse. Or if someone in another department did not want to do something, we had to do it. I realize that in that type of client facing job. you do face a fair amount of abuse. But having said that, it made me very angry to be degraded and dehumanized that way. I left about six weeks ago and have taken to writing down my thoughts just to get it out and try to get rid of all this garbage. I still seem to be carrying this garbages around in my head. Maybe this is part of the process of letting things go, but the anger is still there. How do I get rid of it?