hi Y.;
i'm glad that you will not heed the CIO advice. it's a very dangerous and cruel practice, i never ever used it, and i also live in a crowded apt building, in Queens, but tha'ts not the only reason. it's just a pointless exercise in unhappiness in addition to being unsafe. so congrats to you.
my son , 3, didn't sleep thru the nite till he was well over 2 and my daughter, 17 months, nurses 1-2 times per night. so you are not alone, but the bad news is there's no real knowing how long this will go on for you.
i would only say this; first of all don't blame yourself for the sippy cup thing; it was appropriate and it's hard to wriggle out of it now, that's all. my exp w my kids has been just give them what they need at night, the struggle will end much faster and you get more sleep. once they really feel that need has been met they will phase through it a lot more comfortably, and one day they'll be done with it.
i didn't wean my son until about a month ago and he was so verbal and had so many other ways of being close to me and being comforted, that it was literally a one day event; a week later, he could go to sleep by himself without even being cuddled. my daughter gave up her paci except for night sleep the same way, she just was ready.
which is all to say, don't transfer your anxiety or frustration about this annoying problem, and it is annoying, believe me, i'm exhausted too, onto the child; the less a big deal you make of these things the better off you will be.
good luck!
j