Baby won't sleep on back!

J
Help! 😫 My 2 1/2 week old won't sleep on his back, so I resorted to slightly on his side, and now even that isn't sufficing! All night long he groans and grunts and sounds like he gasps for air every 10-15mins or until he finally gets worked up into a crying spell. I'm a FTM and have no idea how I'm going to get any sleep at all, when all I do is listen to him gasp and grunt. Plus he's not getting any good sleep when he's waking himself doing that. It's almost like its acid reflux or him trying to poop or pass gas. I don't know what to do. I've tried a rock n play, a Halo Bassinest, swaddling, a pack n play and even a co sleeper. Nothing works! He only sleeps well on someone or on his tummy.