Hi Leah,
The anger is part of working through the emotional process. We often deem anger as bad but it is one emotion that helps lead us to change.
I am a therapist (featured on this site) and I have also gone through my own divorce. I find that writing out your emotions can often help. Writing your ex a letter (but never mailing it).
I used a lot of prayer and visualization techniques and once I was in a place to really focus on what I wanted my life and my relationship as a co-parent to be, I made tiny steps to get there.
I also had to do a lot of reframing of my thoughts (taking them from negative to more positive).
Nothing takes away the pain. But talking it through, gaining understandings that make more sens, using healthy emotional outlets and time all help the healing process.
There have been good days and bad days. I have seen many go through this process and while it is not easy, the other side can be filled with great surprises.
I hope this helps. I am always here if you need to talk. 🙂