We have done the chiro from birth too. She's now 2 and a ahalf and we were there today!!

I just wanted to say that it sounds similar to my DD's and I know now that they were both overtired. After 9 weeks, we would put DD in the cot and go in every minute until she settled. She was never alone for more than that, but what came of it was that she knew her cot was for sleep and ever since then (DD2) cot is for bed and I don't get her up once she's in. I even used to pat her in the cot for an hour or two at a time, rather than get her up, as i knew she was tired and I knew she would sleep. It also meant sanity for me, as I could put her down and knew that even if it took a bit of patting, she was going to sleep and I'd get "my time" to revive myself!!!
Good luck xoxo
PS I have to say though, that at 7 weeks, neither of mine slept AT ALL. Not even during the night for more than a hour or two!