Laying on back

Meanwhile im crying.. im laying on my back and its uncomfortable but im propped up, careful to not cut off any blood supply to my baby. If i lay on my side, in a matter of minutes, all the stomach acid is creeping up into my throat. If i sleep like that i choke on it and wake up vomiting because i cant breathe. Nothing works for it. Ive been prescribed 3 different things, i try zantac and tums, and i ate HOURS ago. I have tried every home remedy there is. Im so miserable and need this baby out!!