I was one of those people who survived the shitstorm because of exercise. When you hit the rage stage sometimes nothing seems to be enough. You will cycle in and out of it though.
Since learning about the A I am finding more times than not I come home from a run more full of rage
I was never a runner so running was new for me. I did it because it was the only way I could tire myself out. I was pissed off and sad at the same time. I literally would run or workout until I was ready to pass out. It was the only way I could give my brain a break. If I thought about STBXWW, AP, or the A I ran or lifted harder. It did help me. The thoughts were still there in the beginning but I was so tired that I didn't have the energy to stay mad. Sure it came back the next day but I was at the gym the next day as well.
Don't know if this will help you but have you started any new actiities. Any activities I used to do prior to Dday no longer did anything for me. I gave them all up. Most of them involved doing things by myself or with the EX so it was almost natural that I would give them up. Working out was new to me and it gave me something to focus on. Finding a new strength routine, figuring out which body parts I would work today, focusing on bettering my running times, or getting up to 1,2,3, or 4 miles without walking. The fact that working out was a new activity meant I had to invest time, energy, and brain power into it. It became a short but legitimate break from the shitstorm for a few hours. Maybe trying some different activities in addition to your exercise will help you as well.
The beginning is really tough no matter what but the more time you spend focusing on things you want to do and trying new things definitely helps. Just my 2 cents. I wish you the best.
ETA: You won't be angry forever and it won't consume your thoughts forever either. it does take time and you will cycle through the stages a few times. Just remember that whether you R or D it does get better.