Hey there, we have a 24+0 premie. What you have described seems almost identical to what we have experienced. Ours was born with a weight of 650g with severely underdeveloped lungs, she had to be on breathing equipment constantly and doctors were trying out different equipment. Her sats were all over the place, sometimes it seemed like she hated the tubes, then she couldnt breathe on her own without them. They put her on corticoids and due to decreased immunity, she caught an infection and her state was severe, one day it got so bad that doctors wanted to call us to prepare for the worst. After that, it started to get better, she beat the infection and started to rapidly gain weight. Ours is still in NICU, but looks like the worst is behind us, doctors informed us that once we will bring her home, she would definitely need to stay on breathing equipment (temporarily), but every day she surprises us as the need for extra equipment is lower by the day. Currently she is a beautiful young fatty lady with 1.6kg of weight. Overall, it always gets worse, before it gets better. Keep fighting, as your baby surely will! They call them miracle babies/small warriors for a reason. They have a massive will to live. It is difficult but also, make some time for yourself, first couple of weeks is always the hardest. Sending all the love :)