Dealing with mental health (low moods and anxiety) by forgetting the past and improving my relationship with food/stop comfort eating

I am high-functioning on the autism spectrum, and currently I am doing a Masters degree in Library and Information Studies. I have been struggling with dealing with being resiliant and self-esteem since I have been bullied at school. I have managed to get good GCSEs, A Levels, and a good undergraduate degree, but I struggle to move forward from the past which has left with bad anxiety and comfort eating issues to make me forget them. Does anyone have any strategies about how to be more resiliant and not let a bad day encompass how you feel for a long time (meaning, how do you get through them without reminding yourself about them)?