Maybe you are doing your part in forgiving (not condoning) those who wronged you. You are doing your meditations and seeding the right thoughts in your mind.
Then, all of a sudden, you are dramatically ejected into a super-negative thought and you almost lose your patience.
What to do then? As Victor Frankl said that human freedom to choose your attitude could never be taken away from you; so choose your attitude even when especially it is the most difficult. Extreme heat creates gold. Never it is by the effect of plane vanilla environment. Because more than anything else, if you die today, you just have to make sure that you were authentic with yourself. That is called peace.