Listener question: how do I get rid of resentment?

Listener question: In recent months there has been more and more phases where I am overflowing with love towards nearly everyone in my life, uninhibited joy about life and aliveness. And then there are these phases of old familiar pain. Often I wake up with intense bitter and resentful feelings in my throat. The mind replays stories of people having been hateful and hurtful. The undercurrents of rage in my system are difficult to be with. When the self feels like that not the best decisions come up.I suppose the question would be how can I be more unconditional loving with myself and others in these times of the distorted lense?