One of the worst parts of depression is struggling with memories that resurface with no particular reason. You are definitely not alone when it comes to this symptom. I've struggled with many memories that I thought were insignificant and buried coming back during episodes of depression. I think the main thing we must do is force ourselves to do things that take our mind off of the memories, whether it's being around people that love and support you, exercising, or cooking, etc. it's so important that we not get stuck in our minds, because once that happens it's so hard to get out.