I don't know what happens

I don't know what am I thinking right now ~
I'm confused what I've done
I've done something wrong again
and this make me recalled many events


the feeling of sad comes to me again
everything comes back again
is AGAIN


I'm scared
I don't know what should I do
what steps shall I take ?


can someone tell me ?
can someone control me from being thinking about past event ?
can someone help me to control my emotion ??????