Hi yellow. My DS1 (age 4) had his biopsy/endoscopy a couple of months ago. It went well, and the hospital did everything very kindly. All the staff were lovely with him, and explained things to him very nicely. For the general anaesthetic, he sat sideways on my lap, with one nurse showing him a book, while others stood behind me, putting in the needle and general anaesthetic behind his back. (He'd had the local anaesthetic cream on his hand).
They asked him to count to ten - he didn't make it past two. I felt him just go limp on my lap (which was rather an emotional feeling for me). Then the nurses/doctors helped transfer him on to the table and they told me to give him a kiss and walk out of the door.
The procedure only took half an hour, but as you can imagine, DH and I were completely on edge, pacing around, waiting for it to be over. The only thing I can fault the staff on is that they were a bit slow fetching me back to the recovery room - I wanted to be there when he woke up, but he was already awake and a bit upset (though a male nurse was being lovely and reassuring with him).
He was a bit tearful and grumpy for the next hour or so - partly because he was starving as by then it was about 2pm and he hadn't eaten since 7am. Make sure your DH takes plenty of (gluten-free) snacks with him! Once he'd eaten, he felt much better. They let us go home after about an hour (once they'd seen he was fine, and he'd done a wee.)
The next day he was absolutely fine - went to his swimming lesson and was running about.
I really sympathise with you on having to put your DS2 back on gluten. My younger son (nearly 3) is still on gluten and having coeliac symptoms. His blood test was negative, but given the symptoms and family history, the consultant has agreed to biopsy him - next month hopefully. I really want to get it over with and be able to go gluten free with him too.
Let us know how the biopsy goes on Sat, and the results.