Trouble going to sleep

Katelyn

My 5 month old son is going through a very difficult time. He is awful when it comes to going down for naps and bed time. I used to feed him to sleep which I know I shouldn’t do, but it was the only thing that helped and now that has even stopped working. He doesn’t take a pacifier. Trust me. I’ve tried them ALL. I put him down and he screams!! I used to rock him and feed him then either put him down asleep or feed him a little while he’s laying down in the crib. Both have stopped working. Right now he’s upstairs and he’s been screaming for 15 minutes. Holding him doesn’t soothe him. I don’t know what else to do. He’s fed. Changed. Swaddled. His room is dark. Sound machine on. Warm room. What else can I do?!?