Among the list of things you DO NOT (and yes, I was just shouting) want, near the top should be an eidetic memory. An eidetic memory, popularized as "photographic" memory, is a huge curse for those with depression, PTSD, or the like.
Think about it, there are things you *want* to forget in life, but never will be able to. Almost anything can trigger a flashback; and when your life plays back like an episode of "Highlander," you find it difficult at best to make any meaningful connections in life.
So many of our memories are covered up or suppressed as a defense mechanism, but when they are always there, the stimulation is overwhelming at times. You find yourself not able to live in the present when your past is so prevalent. You cling to a few good memories, but always remember the quote from Dante:
"There is no greater sorrow than to recall in misery the time when we were happy."
So many things I wish I could forget.