Advice Needed

Next week, Quinn will be 9 months old. For the past two months he has not slept through the night. Today Chris and I both went to work on about 3 hours of sleep. His current wake up time is 11pm, 1:30am, 3am and 4:30am. At 4:30 he had his first bottle of the day and slept until 6:30. The problems first started when he had the stomach virus and was having horrible diapers throughout the middle of the night, then we went into congestion and he couldn't breathe, then the ear infections and then RSV. But, he is well now and still finding reasons to wake up. And when I say "wake up" I mean, screaming at the top of his lungs standing in the crib shaking the railings. Sometimes he has a paci in his mouth, sometimes he doesn't. When you lay him back down and rub his back, he growls and kicks his legs. We thought perhaps he was going to bed too early, but no, we've kept him up later and it has the same outcome. Last night we tried the Ferber method - going in to check on him and spacing it out, and essentially trying to let him cry it out - he screamed from 11:24 until 12:30 (not to worry, we were checking on him and listening the whole time through the monitor) when I went and got him and put him in bed with us. Then Chris and I spent the next hour watching him flop around on our bed like a fish out of water, crawling on top of his and ramming his head into the wall. At 1:30, I put him back in his own bed. He screamed for another hour, woke up at 3:45, which is when I broke down and gave him a bottle. We are at the end of our rope. During the day he takes an hour nap in the morning and a smaller afternoon nap. He plays and is happy. He is a champion eater. And for the most part, he sleeps great from 6ish until 11...and then all hell breaks loose. Prior to January he was the best sleeper ever - from 5:30pm until 5:30am - with almost hardly ever a peep in the middle of the night.

So, what to do? What to do? Any suggestions or advice to give?