help..heart burn, acid reflex or indigestion

I just don't know what to do anymore :'( I'm 35 weeks prwgnant with baby #3 and every night I lay down and roll around I have really bad heart burn and some times I wakeup with puke in my mouth. my work involves a lot of talking and some days it's so bad I can't even finish my sentences. now I'm dealing with the worst pain in my life, I can't stop burping, my chest is tightening up with pain and I've have a bad taste in my mouth for days. I dont know what to do. Tums don't work as much as they did at first and I've read to sleep on my left side which I have been doing... HELP!!!