Well, you're there so you probably have a better idea what's going on but from here, it does look like the meds might have helped.
I think perhaps what happened here: (Your post - I had to open another browser to figure this out, I'm so non tech savvy!)
SUNDAY -(PUt him back on 2 x doses of Ranitidine)
WU 6.05
S 9.50-11.55
S 16.00 - 16.20
BT 20.00
MONDAY
WU 6am - fell back to sleep in our bed til 7am
S 10.55 - 12.10
S 16.05.16.20
BT 20.00
TUES
WU 6.30
S 10.15-12.15
S 16.05 - 16.25
BT 19.55
WEDS
WU 6.10
S 10.00 - 11.10 - woke v happy
S15.00- 15.25
BT 19.10 seemed OT
NW 00.50 - 2.40am - he wasn't crying at all when I was in the room with him, just fidgeting about. He would seem settled, so I'd leave the room for about 10mins and then he'd strike up crying again. Eventually hubby went in which DID make him cry but he settled eventually. He didn't seem in pain - just fidgety really.
(End quote)
is that the meds kicked in, he slept better. His WU time was creeping forward (even a 7am one day!). What I think makes the difference for him is the PM nap. It looks like he is very sensitive to PM OT - and perhaps that wakes him in the night? Not that he needs more PM sleep but *when* that sleep takes place, iyswim.
That's a bit abstract. So, concretely, I would say to start pushing his AM nap a bit later (gently) and trying to keep his PM nap around the 16h mark.
I can imagine you're pretty fed up of the whole thing by now! Wishing you a quiet night.