Gaging or feel like vomiting when laying down??

Yellow mellow
Anyone else have the same problem gaging or feel like vomiting when laying down?? Feels like something is stuck in my throat, It  is going on for weeks I am 6 months pregnant almost going on to 7th month. I cannot eat a lot cause I can't breath when laying down, when I'm sleeping all of a sudden I wake up because my breath gets stuck. I don't know if I should be concerned. When I eat less I'm fine I don't have any of the symptoms I have mentioned not only that I eat less anyway so I don't know why it's happening to me or what's going on.