At my wits end

I just don’t know what to do. My son will be 8 weeks old tomorrow and for the last 3 weeks or so he won’t sleep past 3am, every single night at 3am he wakes up and just grunts and whines and throws his legs straight up and kicks and rubs his face and spits his pacifier out. He might sleep for 5 min intervals between like 3:30 and 6am, at which point I have to get up anyway to get my older son ready for school. I start a new job Monday going back to work full time and idk what I’m going to do. I can’t work 9.5 hours after being up since 3:30am, there’s no amount of coffee that will help. Also, he’s been seen for reflux, I was told to change his feedings to 2oz every 2 hours at about 4 weeks old, well that lasted for all of a week because he wouldn’t even make it an hour before screaming for more formula. He spits up SO MUCH!! So we went back 3oz every 3 hours, things were going okay for about 2 weeks, now he’s screaming for more not even 2 hours later, so I’ll make him 1-2oz just to hold him over only for him to vomit up what seems like both bottles all over the both of us before I can even sit him up to burp him, I’m getting so fed up changing both our clothes 4 or more times a day, not to mention, now that he puked everything up, he’s hungry all over again. He used to nap so good during the day, now he will barely sleep 15 mins if I’m not holding him leaving it very hard for me to eat, pee, fold clothes, do dishes or anything. I just don’t know what else to do.

*he sleeps in a swaddle sack with his arms up, I’ll include a pic.

*we have a pretty good daily routine established so I’m not sure what else I can do.

I cannot sleep sitting up from 3:30 until 6am anymore, my back and butt can’t take it. I’m just so done.