Help! *Triggers*

So have you guys heard of that 12 year old girl that committed suicide? (Katelyn Nicole Davis)... Well she live streamed her suicide, and I seen the whole thing! 😭 ... Now I can't sleep, have nightmares, and just cry at random... The poor girl hung herself from a tree after saying sorrys and her suicide note outloud, and then said good bye, her body just dangling, and twitching from dying a slow painful death..., I can't get her or the live video out of my mind! 😭😭😭😭 ... How can I help myself from reseeing her in my mind 24/7? How can I help my physical and emotional state!? Im 19, and I've seen alot of death/suicides and this Katelyn suicide is just hitting me hard... Help! 😭