Dealing with Abusive Ex and Dying Grandmother

My grandma just got moved to hospice today and my highly abusive and narcissistic ex is coming in town this weekend to see my daughter for their legally required visit (which she is dreading). I feel so overwhelmed by emotions and worried all this stress is going to ruin my progress I’ve been making. I just feel so upset and I’m having trouble moving forward since these events make me lose my motivation to try. I don’t get what the point of healing is if I still have to deal with unfair things all the time I’m just very frustrated and angry that I try my best to heal and be a good person and I have to suffer either way.