M.M.
Water can totally flare up heartburn. Mine was so bad during my third trimester, I agreed to go on Prevacid -- although I am super anti-medication during pregnancy. It was so bad I couldn't sleep, even sitting up, and felt like I was going to vomit constantly from the acid in my chest and throat. I tried every natural remedy (drinking vinegar, eating a tablespoon of hot sauce, pickle juice) and went through so many Tums but none of it helped. If you can't take it, talk to your doctor and see what she can do.