Read your narrative to my wife and she was equally amazed, and then paraphrased the cowardly lion:
"We do believe in God, we do believe in God, we do believe in God"
You are right that God exists. Your testimony is stronger now and you should share it with other believers to help strengthen theirs. Glad that you will heal and be there for your grandchild/grandchildren.
God blessed Theo by keeping grandpa from having any vital organs damaged. May He continue to bless you, Theo and the rest of your family for many years to come.