Totally understand the struggle, heartburn plus back pain together is really no fun! What I've generally heard works well is to sleep on your left side with a pillow tucked between your knees, which helps take the pressure off your back and also eases things off your liver and kidneys. A pregnancy pillow is actually great here because it supports your belly, keeps your knees aligned, and you can slightly prop your upper body at the same time, so you get the elevation for heartburn without lying flat on your back. My sister-in-law swore by this combination from her second trimester onwards and said it made a real difference. Some mums find the pregnancy pillow a bit bulky at first, but most seem to adjust after a few nights, probably worth trying before ruling it out.
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