Dark shadows

Sometimes they creep up on me and other times I'm struggling to even remember them.
I go on for so long without them that I feel normal again. Then bam there within me. I can't escape them. They trap me, stab me and leave me for dead.
I wish so much to cave in to them.allow them to take over me. But I know they will pass soon and then I'll be back to forgetting how they felt. Only theres a scar left behind. To remind me.