My DD (24 months) had grommets done 4 days ago. I feel like I have brought a different child home from the hospital!!
She hasn't had one tantrum since coming back (whereas she had previously had 5-6 major kicking, screaming, on floor tantrums a day), has slept through the night twice in a row (first time since March...) and spends her days happily playing and singing to herself (instead of clinging to my legs and grizzling 24/7)
It is AMAZING 
Thought I would share in case anyone else is thinking about the op...