yes, everyone feels that way, and it is completely understandable - BUT at the same time, yes you ARE being irrational, and you do need to enable yourself tobe very calm and confient until your DS is asleep .
For gromets the GA will be v short, the anaesthetist stays with the patient monitoring the throughout, and the chances of there being any problem at all really are ngligible. If you travel by car, you are more likely to have a serious accident on the way there that anything go wrong as a resul of a GA - and you aren't goin tobe pnicking about driving there, are you?
It feels awful - i won't pretn it doesn't. DS has had 6 GAs now, and will have another a week tomorrow. It is always wrenching to see the asleep on the trolley, BUT the children are usually completely unfazed by it - the pain is all yours, I promise.
They will let you stay with him until he is unconscious - you will hold him on your lap and either they wil give him gas first - which does work v v quickly, within 10 secs, or will be very skilled at putting it in the canula with the child hardly noticing.
Mak sure you know where to wait so that they can call you down (a nurse will usually accompany you) once he starts to regain consciousness in Recovery - you will be there as he is waking up.
Take some easy to eat nutritious snacks and drinks that he likes - he will be v hungry and thirsty once he comes round.
Also - when you ask 'how long does it take' don't be scared if they don't call you for a lot longer than that. IME consultants can often give a v short time - forgetting that often their bit doesn't start for a while - the anaesthetist can spent ages finding veins for lines to go in after the child is unconscious, prepping etc. On the other hand it may all be over in a trice f a small uncomplicated procedure like gromets.
Good luck - it always feels MUCH worse in the run up - and a big relief and not as bad as you feared afterwards.