That's never a good sign Rainy. Hope her customer service improves!
Hmmmm can the little man do more than one sleep cycle or is he waking every 45 minutes all the time? How many day sleeps is he having? how long are they? Just thinking of the old sleep promotes sleep thing.
Is this normal for him, or is he worse than usual? When Lu was getting top teeth she woke every 45 min, now she can do a decent stint again. Maybe he is unwell or in pain (if you think he is in pain have you tried panadol?), or he might be working on his next big leap. (as in walking)
I tried really hard for a few nights not feed her all the time. It took a while, and a bit or corridor walking, but she got used to being cuddled to sleep, rather than fed. Now i am working on patting rather than rocking her. But this whole process has taken weeks. Slowly, slowly i have tried to break each habit.
During the day i go into her room at 40 min mark and gently pat her, or run in when i hear the first squeak, she stirs but doesn't wake up and generally i can get her to settle for another 45 min. This only works in the morning though, not a chance in the arvo.
Like someone suggested, maybe he has a food intolerance......
What happens if your man settles him? That was the other thing we did to try and cut out night feeds, DP would go into her and try and settle. (Didn't always work, but did/does sometimes.)
Sorry i am certainly no expert, i was in your shoes not long ago. But thought i'd share some ideas, you never know what might help...
I think from all the reading i have done that consistency is most important. But as it says in no cry, if it's not working, dont sweat it, go back to the old way of settling and try again next time.
Hope things are better tonight. sorry for rambling, i should be in bed! xxx

ETA- have you given him a 'lovey' that smells like you? i found that helped too. I wear it down my top during the day sometimes, and then it smells of all my gross sweat, but she seems to like it!