big hugs to you , we have all been there, it can seem so tough and us mums we live so much in the present, it is hard to imagine the future and any hope of success. Little ones def pick up on change , we also went on holiday around the three month mark and moved house and our DS def did not settle straight after, it really depends on temperament. Also, before the three month mark they do not form sleep associations and then they start , so it is really important to estab a good night routine, i have been bathing luca every night from one month, even if it was just a two sec splash, just so that he would know that a bath meant bedtime and i have never had any prob getting him down for the night. I had to do a week of pupd and sh pat to cure paci addiction and estab good nap routine and it was hell, and you feel like you are doing nothing right, but i can assure you you are doing just great, just being aware and trying to put your baby on the right track is the first step. I live in the south of italy, and you wont believe how the little babies here suffer and the mums are completely oblivious. They are all kept up till midnight, go to sleep in parents bed.. and then the mums moan that their babies are still feeding every hour, dont sleep in the day, and have severe seperation anxiety at the age of fourteen fifteen months... so we are all doing just fab in comparison!!