A quick post - had the worst day of my working life today, no kidding (and that includes working at Little Chef, although thinking about it, Little Chef was lovely compared to where I am now!).
Had some truly horrendous news about a friend - she's seriously ill in hospital, had been getting sicker for a month (but only a month) and she has a massive something in her abdomen - nothing confirmed but they strongly suspect cancer and a really aggressive one too. She has a little girl same age as Iestyn. 
Anyway I'm all misery here. Can't even do the Santa thing because Iestyn can't speak English! 
Spider I'm partially deaf in one ear.
You might think it's a bit weird to put a smile there, but really, it's nothing. I can sing in tune and everything! It's only obvious because I speak rather loudly, but that's not always a bad thing - nothing worse than someone who mumbles. (Or maybe I'm saying that because...hmm, there's something which never occurred to me before!) Anyway, W might not be deaf at all. Obviously, you don't want any worry or niggle at all because he's your little boy, but it's early days (he might not be doing well on the tests because he's so little?), and he has passed on one side.
I promise I'm not making light, but speaking from experience.
And going I was your DD2 - I second what you said. And repeat ear infections like I had were far, far worse than the hearing loss - that's nothing compared to the infections. (I have 1 million times sympathy for your DD2, and I urge you to be a pushy mother on this, get the consultants and the best possible help. An ear infection is up there with childbirth in its horror. Seriously. And the only thing that's worse than childbirth is a tooth abscess. I know, because I did childbirth and the abscess within a few months of each other.)