He is also cutting his canines right now,
We got some horrible NW at 3/4am when our DS was cutting his canines - they were by far the worst ones to cut through so far. I hate to say it, but I think you may just have to ride this bit out until the teeth are cut, and then reassess the situation, as doing sleep training while he's in pain isn't a good idea. And you won't know how much of your troubles are related to teething versus routine or other issues. Do you medicate before BT? Have you tried to do a meds DF? I never dared do that, but I know of others who do. Or if he does wake in the night, dose him up with meds, apply teething gel & try to resettle him.
I probably wouldn't stop giving the milk while his teeth are cutting, but once they are done you could stop & use a sleep training method such as WI/WO to help him to re-learn how to self settle.
he gets his milk in the dark room with me holding him in the recliner. The last few days he has been fighting me when I hold him still after his milk. I put him in his crib told him it was time to go to sleep. he ended up chatting and bouncing for about 35 mins before he started getting upset
Maybe its time to change this up a bit now he is older? I know if I tried to hold my toddler still in a dark room he would have a screaming fit! If you want to keep with the milk in his room that's fine but perhaps just put him straight into bed afterwards (once teeth brushed of course)?
If it helps, we do milk downstairs, read a story then up to brush his teeth & then bed & he settles fine. I think we are going to start letting him climb up the stairs to bed too - he seems to like it when we let him do things that make him feel grown up.
Also wanted to ask do you stay in the room until he is asleep?
ETA: also forgot to add at 17 months there is a huge developmental leap going on - Wonder Week 75 & sleep can also go very wonky down to that.