Hi there!
Just a couple suggestions - walking around really helped me. Taking deep breaths and changing positions while walking around slowly helped a ton. It's all due to your uterus pushing on everything, so gentle movement and relaxation can help a lot. If you're having a hard time you really have to ask your OBGYN - but PLEASE stay hydrated! Cutting back too much on water can do more harm than good! It's a terrible feeling, the persistent heartburn - lying down to sleep is awful! I started Zantac after a few weeks of sleeplessness and lived on Gaviscon tablets. They're convenient and I find they work better than liquid!

Good luck!!
M