Hooked, I just saw this and you are definitely in my prayers. I was just recently asking for prayers for my twins that came into the world a little early, and the Lord answered those prayers. He will answer your also. I have no doubt.
My sister was born with a heart defect and has underwent surgery three times, once at birth, once at about 4, and once at 18. I can't say I know what you are going through as a parent but I can relate. It's scary. The Lord's hand was on my sister throughout all of her surgeries and I know his healing power will be with you and Garrett. God bless.
Aaron