Let's cover the biology bit first.
Your body is automatically making milk right now... and at a fast pace. Within a week to 10 days from now your body will quit producing automatically and will shift to take cues from your baby to make the right amount for her. This will continue until you quit breastfeeding.
The way baby cues your body is through sucking and draining the breast of milk. This tandem dance will occur for the next 6-8 weeks or so until baby stops her ubergrowth pattern.
So a hungry baby sucks more and completely drains your breast which entices your body to make more for next time.
Hungry babies aren't real fun to have around and they need lots of love and support and hugs and cuddles. This doesn't last forever- it's natures way of getting things all figured out. Every lady that has breastfed past this time will assure you it WILL GET EASIER. But the worst thing you can do is offer something other than your breast - even when you think she's hungry. The fact is, she IS HUNGRY, she needs to have a chance to tell your body this, so there's enough for next time!
As far as the expressing bit, there's a few women here that have been successful starting expressing BM that early, but most women don't have success, or find it more draining than just feeding directly... tinytoes, Ragirl are both great resources for expressing and they can help you sort it out... But to be honest, unless you are able to pump successfully- this isn't something you should be thinking about doing until after you've regulated and things are getting easier as you may undermine your breastfeeding.
You may also consider avoiding giving bottles for the first 4-6 weeks so you avoid nipple confusion...
Babies have brand-new-never-used digestive systems. It's a weird feeling to them to have trapped air circulate in there, its weird to have food down there, its weird to poo and pee and fart. Breastmilk IS the easiest food for them to digest and is easiest on their brand new systems, and delivers the best nutrient ratio to them.
Things will get better hun, I promise. Your best bet is to camp out with your brand new little girl, on the sofa, with lots of water and healthy snacks... let her suck and sleep. Most of us breastfeeders spent the first month or so on the sofa with LO's. It's an exhausting time, but so worth it! What better way to spend that first month with baby than cuddling, and getting to know one another?
Also, I encourage you to go to this website and consider getting this book:
www.thehappiestbaby.com
And read this article about a baby's cry:
https://www.askdrsears.com/html/5/t051200.asp#T051204
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