Idk what to do

I have been nursing for 3 and a half hours now. It’s 1:30am and last night we didn’t go to bed till 4 because the baby just won’t go down. I’m so overwhelmed and tired right now and my fiancé is asleep next to me and all I can do is cry. I’m so over this, it’s so hard idk what to do. My daughter is 3 weeks. She had 3 good naps today for the first time in a couple days after literally not taking one nap longer than 15 minutes, but she woke from the last one around 8pm tonight. I don’t have a mom or anyone to talk to and get advice. I just want her to be able to sleep like she does during the day and it never happens. She falls asleep nursing, I try and keep her awake and try the other breast, burp all that and she shows signs she’s done, then when I thjnk she’s all sound asleep she wakes up and cried again. My boobs are completely drained right now yet I can’t stop nursing her.

When does it get a little easier/sleeping through the night?