Have you tried ideas from the Happiest baby on the block by Dr Karp?
http://www.happiestbaby.com/
He uses the 5 Ss
• Swaddling - Tight swaddling provides the continuous touching and support the fetus experienced while still in Mom's womb.
• Side/stomach position - You place your baby, while holding her, either on her left side to assist in digestion, or on her stomach to provide reassuring support. Once your baby is happily asleep, you can safely put her in her crib, on her back.
• Shushing Sounds - These sounds imitate the continual whooshing sound made by the blood flowing through arteries near the womb. This white noise can be in the form of a vacuum cleaner, a hair dryer, a fan and so on. The good news is that you can easily save the motors on your household appliances and get a white noise CD which can be played over and over again with no worries. If crying, the noises needs to be as loud as the crying
• Swinging - Newborns are used to the swinging motions that were present when they were still in Mom's womb. Every step mom took, every movement caused a swinging motion for your baby. After your baby is born, this calming motion, which was so comforting and familiar, is abruptly taken away. Your baby misses the motion and has a difficult time getting used to it not being there. "It's disorienting and unnatural," says Karp. Rocking, car rides, and other swinging movements all can help.
• Sucking - "Sucking has its effects deep within the nervous system," notes Karp, "and triggers the calming reflex and releases natural chemicals within the brain." This "S" can be accomplished with breast, bottle, pacifier or even a finger.
he also talks about how the noise inside the womb is louder than a vaccum cleaner and that the sleep enviornment actually needs to be loud not quiet (using a white noise machine or he has a CD)
hope that helps. Good luck!