M.D.
Pray, just do a lot of praying... My son just had surgery 25 months old. He did just fine, the worse was the waiting. He jumped right back to himself, he wanted to play and be himself and nothing was going to stop him. Pray for peace of mind, I know the doctor was great I had, and he told me everything, including the worse possible outcomes, however, I felt peace, the surgery went faster than I expected. I was able to hold my son right away and by the end of the day he was wanting to run and jump around.
God Bless be very thankful you have a supporting family!