I was in a very similar position Joata, about 10 years ago. My marriage was quite long (25 years) and had been very complicated in places. We are both very civil to each other when we meet now and ask after each other politely when we see the children, but I think even now, we would not agree about certain things that happened during the marriage. We would both have differing points of view and for the first year after he left I could get quite worked up thinking about how I would like to sit him down and talk things through with him, then I could get on with my new life. In the end, I found the best thing to do was to write a long letter to him, seal it in an envelope and set fire to it.
I agree this is a very safe site to let off steam on and I do think counselling would help, but I think that you will be surprised how much better you will start to feel soon. The first year is definitely the worst. Good luck.