We have a 5mo ebf DD.
She is such a happy wee soul and we have a great bedtime routine with her sleeping from 8:30 till 6/7ish the next morning (not a stealth boast honest this is relevant later)
DH and DD get in really well through day no problems there.
She has never taken a bottle so that DH can feed her with expressed milk but we have had a break through with a sippy cup with a soft spout! At last! She takes milk from this happily through the day, but most feeds are BFs rather than from cup.
I have a night away with the girls booked in September so we have been trying in preparation for DH to settle DD at night and it turns into absolute meltdown 
I know it's probably because she is tired so less accepting of change. I have been keeping out of the way and taking the dog out etc and DD had just been screaming and crying till she eventually falls asleep through exhaustion (still sobbing in her sleep) and after not taking any milk. Because of this she wakes repeatedly through the night looking for reassurance. DH feels terrible like he is doing everything wrong and I know he isn't. Has anyone else been through this or have any advice? We are both feeling awful about it and could do with some help to make it and easier transition. We are trying at the moment both of us doing bath time bed time one night (just like normal) and DH the next.
Sorry this is a bit of a ramble!