I am losing my mind

[DorsetJo]

My son, Jamie is 17 months, never been a good sleeper.
He goes to bed beautifully with a bottle at 6.45/7 and sleeps, usually til 3-4am when he cries, gets another bottle then sleeps til 7.
Recently he's been waking more and more so we've been trying to not give him a bottle (as he's just waking more and more frequently, and draining pints of milk!)
He's going insane. He cried for an hour between 12-1 and then woke again at 4.30' and I gave up at 5.30 and got up with him. He refused milk out of a beaker when he gets up.
What shall we do!?! We are all exhausted, especially Jamie who's behaviour is just getting worse and worse in the day as he's knackered and pushing boundaries.
He naps well, for 1-2 hours at nursery (going down without milk) but will only go down with milk at home. (We've tried without, resulting in 2 hours of screaming)
Help!

My son is 3, we've had about 10 nights sleep in those 3 yrs .

Had same trouble with bottle (if a bit younger though), started putting him down at 7.30 with cup of milk before he went (bout 3oz). Just told him bottles were gone. He still doesnt sleep, but soon copped on that he wasnt getting milk during the night (he gets water if hes unwell - will drink if thirsty).

Now he just screams for no bloody reason cept that he can .