I think I went through a period of 4 months where I had Pstd but I didn't know that's what it was. It happened after I was confronted by 2 men who broke into my house. Your situation is much worse though. Is there additional medication you could take that day and will you have someone else there with you.

I think you might find comfort in knowing, if you do this, you will feel better afterwards. Meaning when we confront what scares us, we feel better afterwards. I think it would help in knowing that it's normal to feel scared and it's okay to let the feeling come, but you don't need to runaway. Visualize yourself there by your son's side and supporting him. Maybe do some slow deep breathing. Have your son bring his favorite stuffed animal and you hold it for him during the surgery. I hope his surgery goes very well. I'll pray for both you.