Hi Amy,
I hope I can express my thoughts without messing up due to language questions.
First of all, big hugs to you. I can imagine how you feel as I've been through a nurse strike with DD1 when she was around Anna's age and it was not fun at all.
For her NF I pulled her into bed with me and thought happy thoughts while I cuddled her for a minute
This is the key! Try to keep your mind with happy thoughts.
Don't push too hard on yourself, I know you know this but all this stress makes the letdown even harder, we get anxious, the baby feels our tension and the letdown never comes. So I know it is easier said than done, but try to keep your mind at ease.
I would think that if your body adjusts to how much a baby needs nursing all day and night, couldn't it adjust to the daytime feeds? If you think about it, there are lots of LOs who STTN at 6 weeks, and their mom's supply doesn't dry up, right?
I totally agree with this. I think if you make it nursing during the day, then your body will just adjust to how much she nurses. And during the night, while bottle feeding her if this is what you end up doing, don't think that you should be feeding her instead. Think that this is the way you both are calmer and happy together.
Whenever you get yourself confident again (because I know we lose confidence in ourselves, making things harder) you can little by little try to offer the boob at BT, for example, so that your body "understands" that there's a new demand for that time of the day.
My last thought: I don't know if you would be able to do it, as I know you have to do BT by yourself as your DH is working, but instead of trying to express, have you tried only massaging your nipple, rolling them? This article from kellymom was what helped me when I was struggling with DD1.
http://www.kellymom.com/bf/supply/letdown.htmlI HTH and will keep my fingers crossed that Anna helps you go through this. You can do it!