What do you suggest if i had a traumatic event and so scared of it happening again that i can't stop thinking about it or sleep?

PTSD : Post traumatic stress is a normal reaction for 3-6 months. If it's affecting your daily life, you should seek medical help and see a psychiatrist.

Clearly this has: really affected you. Don't know how long ago this occurred but it is negatively impacting your quality of life. Encourage you to consider evaluation by a psychologist or psychiatrist so that this can be addressed. Things can get better for you. Take care.