Hello Kate,
We sure have a lot of devoted grandparents in this forum. How great is that?
Whenever someone asks a question involving health issues, I always have to put on my nurse's cap as well. Certainly a big issue will be the pain and the second issue is bleeding (don't mean to scare you). If you are unfamiliar with surrogate tapping, see my post under that heading for some general guidelines.
Tapping "as if" you are your grandson, try these statements:
"Even though I have to have this operation and they say it is going to hurt, I choose to feel calm and comfortable."
"Even though they are going to give me this operation, I will heal quickly and easily with hardly any bleeding."
"Even though I am having an operation, I send healing to wherever I need it."
"Even though I am scared to go to the hospital, I will be safe because everyone will take extra good care of me."
Some pre-emptive tapping would be a good place to start for calm, comfort and healing.
Hope this helps.