4 month sleep problems

My son is 19 weeks. About a week and a half ago he started waking early in the night. He goes down at 730 and wakes for a feeding between 12-130 and then another feeding around 4-430. We were getting ready to start working on eliminating the second feeding but then he started waking at around 1030 for no reason. Sometimes we could stick a pacifier in his mouth and he would go back to sleep. Other times he would scream his head off and it would take us an hour to get him back down or I’d end up nursing him because it was the only thing that calmed him. Then Saturday rolled around and he had a pretty good runny nose. That evening we put him down for bed and he woke multiple times that night throwing up yellow, mucousy bile. He sounded like he was drowning. It scared me half to death. The only way we got him to sleep was to hold him propped up. The next night he was no longer throwing up but he was running a fever that finally broke at around 4 am and we were all able to get a little sleep that morning. The last 2 nights he hasn’t seemed sick he’s just had a little runny nose. I would put him down at 730 but he would wake at 1030 1230 2 4 530 and 630 (sometimes it would take an hour or two to get him back down) I would try to feed him at 1230 and then at 4 or 530 but I can’t hardly get him to eat. Even during the day he fights me. He arches his back and screams and I have to force him to eat. He will get going but won’t eat long. In the last 48 hours he’s had 16 poop diapers. They started out like mucous diarrhea and now are back to normal. (He’s usually a 1-2 times a day pooper) The last 2 nights he has also broke out of his swaddle multiple times and has been fighting it. But when I unswaddle him it upsets him even more. He hates having his arms free. He cried for 2 hours last night before I could calm him...all this being said my son is usually very happy, calm, playful and sleeps pretty well. So all of this is very out of the norm for him. I need advice from other moms on what to do or what you think is going on. I am very tired and confused and have no idea what to do at this point. Please help 😭