Chest/Esophagus Pain Laying Down..?

I’m 29 weeks pregnant. I have had to sleep upright for two nights. Figured it was acid reflux. I’ve tried tums, Pepcid (recommended by Ob), ginger... Then after that get nauseous so would take Zofran (prescribed by Ob). Nothing helps. To boot, constipated, still taking Mirilax. I just want to be able to sleep without the added back pain and chest pain.

Update: Come to find out, I was severely dehydrated. Ended up at the hospital with IV. I ended up with contractions as well. Had started vomiting and crying. My husband refused to let me be stubborn. Glad he forced me to go, cuz I hit ketoacidosis. Not diabetic, but my kidneys were overworked. Be careful out there! Drink even if you’re not thirsty. I had no signs or symptoms other than acid reflux, ligament pain, and minor inflammation in my right ribcage down my lower back (which isn’t unusual for me).