I don’t know what to do 😔

FTM with a 20 day old. Today has been really hard. From 11:30- 2:30 he has cried off and on and I just could not sooth him no matter what I did. He was hungry around 11:30 so I nursed him, and I changed him, but since then he would just cry. He slept for maybe 15 minutes and then he woke up and started crying again. I changed him and nursed him again around 2 because he was acting like he was hungry, and then he was content for a little while. But I feel like I’m gonna lose it. I gave him gripe water, I’ve rocked him, bounced him using an exercise ball, swaddled him… this mama has a headache now and has been crying. He’s finally asleep with me holding him, but I’m afraid to put him down because I don’t want him to wake up. I haven’t eaten anything today because I’ve been taking care of him, my fiancé is sleeping because he has to work tonight (he works overnights), and with my son crying I know my fiancé hasn’t gotten much sleep, so I don’t want to go wake him up for help because he’s already going to be tired and then work all night.

I don’t want to switch to formula, but nursing is really hard because idk how much he’s getting.

Would it be wrong if I exclusively pumped and just gave him bottles instead? I know nursing is best because my body will give him whatever he needs, but I’m exhausted and never know how much he’s getting until he spits up because he ate too much. Help 😔