So, time for an update. I'm writing this quickly as I get teary when I think about it.
Things are so much worse now, its just getting ridiculous.
That one "good night" was all alone - I've kept him off dairy, hes on everything going from probiotics, melatonin natural syrup (not the drug) to gripe water and pamol when I'm unsure......
He's just NOT sleeping.
Last night he woke and I resettled with a feed about 3 hours after putting him down (the usual - starts off as a strained sounded whimper then progresses to a full blown scream) then an hour later he just started screaming really really loudly - no lead up or anything. I started wondering about night terrors?

? I don't know - he was inconsolable. I'd feed but he'd start hungrily then turn his head away. Turning on the light sometimes 'reset' him as did Daddy coming in and making him giggle. Then he'd start up again.
Then he properly woke and was wide awake talking and laughing for 2-3 hours, I lost count. He was awake being either extremely unhappy or awake and chatting (and not taking feeds which is my last resort to settle him) for 4 hours in total.
I'm a wreck.
He has 1 nap a day - 2 hours usually but lately more like 1-1.5 because he's obviously OT despite being the happiest, most easy going little boy during the day. This horrible cycle had started before I transitioned to 1 nap and he definitely naps better now (previously he was having shorter naps and now he usually does really well)
I tried to give him another one today as he woke after 1hr 20 but he just won't do it - even if I try and AP him to sleep he wont have it. If I put him down sooner than 11.30 he sleeps for 1 hour 15 (a sure sign in him of UT) and doesn't seem remotely tired at all until just after 11.15 when I start the routine and get him down as quickly as I can.
On top of all of this, he has developed a cold today so is extremeley snotty so I think I'm going to have to continue trying to settle him until he's well again

I just feel like I've tried everything and we keep going further and further backward.
Any thoughts at all lovely ladies??