Yeah - from 4 years ago - it was about 18 to 24 months of pure hell. I honestly didn't think I was going to survive.
Two things helped, but not a lot:
-Mylicon Drops - really helped degass the baby which helped the endless crying:
http://www.mylicon.com/
-Vibrating bouncy reclining seat (not a full fledged crib vibration, but really helpful to get them to mellow out enough to go to sleep)
http://www.toysrus.com/sm-baby-papas...i-2265153.html
(lots of different kinds out there.)
Good luck. This too shall pass.