I have been really struggling with this...

I forgave my mom and grandmother for the years of abuse they silently did to me and my two younger sisters. Randomly feelings of anger, anxiety and hatred have been resurfacing. How do you forgive someone for years and live a peaceful life and then these dangerous emotions pop up and take control over your life only to leave you broken and tortured by the events that took place. What do I do? Im suffering everyday from reoccurring memories that won't go away.😪