Unfortunately, I experienced this my entire last pregnancy along with hyperemesis and I've done an entire repeat of acid reflux,heartburn and hyperemesis all over again (7days to go). I've been given every med on the market that is allowed in pregnancy and nothing has worked, so, I definitely feel for you. However, if you go to L&D depending on the doctor they may allow you to get a small little cup of liquid that kills the acid completely(dont recall the name).