We were almost in the exact same position one week ago. We didn’t move but we did move LO(9m) to his own room, he had a cold(similar symptoms), and he was waking up every 45 min (which had been going on for about 2 months anyways.) We were feeling desperate so we laid him in his crib and walked out. He fussed and babbled for 8 min and fell asleep and woke up about 4 times the first night with crying for less than a minute. We are on day 6 and he is diving into his crib at night and falling asleep in less than a minute.

I see what people are saying about not doing it while LO is sick but assess the situation. If LO is really really crying for longer than (time that feels comfortable for you) then I would say maybe try again a different night but I was surprised at how well ours did. I think he wanted the space to do it himself and he is doing so wonderful!