Hope your poor DD's tummy settles down soon Kelly. Maybe if you can manage frequent feeds during the day, you can push the night feeds further apart.

The 3-4 week mark is often tough, even if you're not having issues with feeding. They just tend to get very unsettled at that age and it can last several weeks. Take care of yourself

Nic - DS was the same about having to stand. Thank goodness he's finally grown out of that one - does the back in.
Holidays or baby.... good luck making that decision. Maybe take the holiday and then see how you feel about another baby? By then I'm sure your DS will be sleeping really well and you'll be ready for another 3-4 years of sleep deprivation