You’re right - this is absolutely appalling and symptomatic of the NHS being utterly broken.
Are you ringing up regularly asking for cancellations, and are you on the last minute cancel list? I had to do this for my daughter who was awaiting general paeds; she got seen in 2 weeks as opposed to the 5 months we were initially given, and it also meant that a last min cancellation wasn’t wasted.
In terms of experience, I can relate to only one of your son’s issues. My son needed gromits. Same experience as you - hard to hear in outside environments resulted in bad behaviour, in his case, hitting out. He didn’t have many ear infections, but his hearing was so bad he wasn’t talking properly; he was mimicking speech rhythms, but all of his words were a variation of ba. I got the ball rolling when he was coming up to 2. I found the process of referral for surgery slow (around 6 months, felt like a lifetime then) due to watchful waits, but this was 8 years ago so there weren’t massive delays in terms of appointments. Complaining about a 6 month process now seems ridiculously entitled doesn’t it? The NHS has changed so much in just a few years, and as a nation we have just accepted what is now, a truly inadequate service. When he was OKd for surgery we looked into private operation as he really couldn’t communicate and it was heart breaking. We were advised that it could be a long wait. As it happened, whilst we were waiting to get onto the waiting list, a cancellation came up which went to him as he was technically high priority due to not being on a waiting list, so we didn’t get very far with private. I seem to remember the online prices were 1-2k; obviously this might be very different now.
The difference after the operation was huge, and immediate. He came round from surgery and said a new sound, (he was 2 and an half) and over the next several months was transformed into a gentle soul. Close friends with children really noticed as well; this wasn’t my wishful thinking. He had speech therapy and by school age, his speech was only mildly delayed, and certainly not noticeable to his peers. The grommets fell out naturally when he was around 8, by which time he didn’t need them as his ears had grown sufficiently.
Knowing what I do now, I would pay for him to have the surgery, to the price of about two annual holidays (even if it meant sticking it on a credit card). The longer the wait, the longer that psychological impact is there, bad behaviours get set in, as well as in his case, impact on his older sibling who bore the brunt of his frustrations. Obviously objectively he was at an age where behavioural changes are huge, speech is changing, many children without issues start talking at 3, etc etc. But as his mother with nothing to prove, I could see the differences and attribute it all to that quick procedure. If you can in any way afford it please look into the cost of private surgery. Keep calling for the cancellations to get to the operation-approved stage, but once you are there I just wouldn’t hesitate. Your son is at such a crucial formative age, and it sounds really rough on both of you with the sleep deprivation, plus it’s limiting your access to other assessment. You shouldn’t ‘need’ to go private, however the morals of it won’t help your son.