Help help advice

Gabriel

So i have a 35 weeker. He has acid reflux. We switched formula but he still spits up. He barely sleeps an crys a lot. We change him feed him burp him. He Just seems un satisfied. Is anyone going thut this he is over 3 months. He wouldn't sleep in his bassinet. He doesn't like his crib. He only liked his swing an pack an play.i really don't know what else to do.