Thanks so much everyone, you're all so understanding! I appreciate it. Big hugs to the other mamas who have been through surgery with their LOs too, it's such a hard thing and you're all really strong!
My son's surgery was very minor and I have to say I can't imagine the added worry that a major health problem would bring. There are some real rockstar parents out there.
I have to say, also, that the horror has faded over the last week and I don't feel like breaking down over it anymore. I will always remember it, but I don't feel like it's too much for me now, which is great. It has been helped mostly by the fact the my son is back to being a totally cheeky, bouncing off the walls four year old, which makes me feel much better - so happy he's okay! His post op appointment went well too and it looks mostly successful, we have to go back in 6 weeks for another check (hoping like heck nothing further has to be done!).