You are a survivor of a traumatic event that put your life at risk.
This triggers post-traumatic stress, which sometimes passes for a while before living in peace and quiet again. Real emotional wounds have been inflicted that take time to heal.
It is important to talk about what is happening to you with someone who is mature and trustworthy, and if you believe in God, getting spiritual help can be beneficial.
I hope you can overcome this situation because being in a constant state of alert can generate other damages to your health. Happy and long life