A common theme that runs through the daily readings I do is how to get over an unwanted emotion caused by a stressful situation. The answer is always: fill your mind and your time with new thoughts and new behaviors. Do physical activity to integrate the feeling into your body  movements. Seek out fun activities with new people. By doing new and different things, you are rerouting the neural circuits in your brain to have new memories.  The old memories will fade into the past. Easier said than done, but it works if you work it.