I have a similar situation and am desperate for help with my 6 month old. She has slept through the night for the last 2 months, rarely waking at all. On Sept 2 she got her 6 month shots and slept ok that night, every night since then she has been waking every hour or so, crying and crying. She has also been eating less than normal during the day, she refuses to eat more. I think she is hungry at night but I am afraid to go back to a 3 am feeding every night. She has become very hard to soothe and has a very hard time getting to sleep as well. Its almost like she doesn't want to sleep, but is very tired. She doesn't try to play either, she just tosses and turns and kicks her feet and kind of whines. I have tried everything I can think of, I would appriciate any advice. Thanks!