Juat wanted to say ann I really feel for you, it is so utterly exhausting and frustrating.
I also think gro bags are great, even though ds has not had one for months. Just got one out recently as it has turned cold but too small.
He has never had covers either.
This is what works for me...
I also found that all night time feeds. Bottle or BF were better done in the bedroom only.
Bath or wash. Then straight to the bedroom. dried, pjs, story. Milk. Bed.
We changed our switches in all the bedrooms upstairs to dimmer switches.
These have been fantastic.
When getting ds ready for bed and feeding bedtime milk. I have it at the lowest it will go.
He seems to know now when I dim it, he starts to relax.
I am not one to advise on settling techniques as I have tried lots of different methods with both dcs.
DD was great went down awake 90% of the time, but at 2.7 I now lay with her till she falls to sleep. (Not sure what happened there then)
Ds is a combination of cuddle till asleep, Cuddle till nearly asleep. (he then arches back and gets annoyed, which indicates he has had enough and wants to lay down)
Lately I have put him straight down and left to cry. (under ten minutes only) and not every night.
I like you have found that the leave it to cry till settled does not work with Marcus.
He just gets louder and louder and sobs till he can't breathe, and can make himself sick.
Not worth it to me, when I know a cuddle can send him off.
However crying it out did work with dd on the few times I did it.
They are all so different.
I also found that ds settled much better when he stopped bf and had a bottle of ff.
I am not for one minute suggesting you do this btw, because I was gutted when I stopped.
(ds decided himself he had had enough.)
He still wakes some nights, and I do what was suggested on here before.Count to 100 not sure if it ws pf or poppy and if still crying ans won't settle he has another bottle of milk.
Sorry to waffle on, just wanted to help.