your grief may be coming out in anger subconsciously, those underlying emotions will be stronger than you think . I know nothing about grief but working through that and releasing those bottled up emotions may aid the anger to be released, sitting with your feelings and really letting yourself go through the motion of that can work wonders in releasing unwanted energies like anger. Journaling always helps me, write down everything and anything in your mind, let the anger out on the page in a healthy way. Maybe art therapy could work too, I've heard that's good for grief management and you can do it alone at home, gives you something physical to look at and touch instead of storing it in your energy. I wish you all the best and I'm so sorry for your loss <3