Pregnancy symptoms back again

I've had a few weeks of good night's sleep around weeks 15-17. But now in 18th, heartburn seems to have intensified. And I have no comfortable positions when lying down at all. I got a snoogle pillow which helps a bit. But I still find myself tossing & turning and sometimes having bad dreams. There are days when I switch and lie on the other side of the bed. I sometimes dread having to go to sleep because of all these.