How Can I Overcome Fear And Guilt From My Past?

In this episode, Dr. Betters answers the question, "We have lost our 3 year old daughter two years back. I went to work and she was home with the maid. She kept the balcony door open and walked away to do some work. My daughter fell down from the 4th floor balcony and she died. I am not able to get out of my own guilt. I keep thinking if I didn't go to work maybe she would have been saved. So many “if” questions are running in my mind. God has blessed me wth a son now. He is 1 year old. Now I am having so much fear that something will happen to my son also. Even though I am faithful this fear of death is troubling me sometimes. I am not able to overcome this guilt and fear can you please guide me?"