Left side sleeping is highly recommended during this time as it helps with healthy circulation. I used to put a firm cushion behind my back so I didn't roll over to my back in sleep. Keep trying different pillow arrangements, you will find your sweet spot!
Beta, at 6 months, try to sleep on your left side as much as possible. You can keep a soft pillow between your knees and one under your stomach for comfort. Take light warm milk before sleeping, it will help you get good rest.
I totally understand how difficult it is to get comfortable with your growing sweet baby bump. Sleeping on your left side is the best because it increases blood flow to your little miracle. Try hugging a long pillow, it really feels so cozy and safe.
It is so hard to sleep when your mind is racing and your body is changing every day, I completely get the struggle. What helped my anxiety and back pain was sleeping on my left side with pillows tucked all around me like a nest. Just try to breathe deeply and take it easy.
Looking at my baby now, I still remember those sleepless nights in the sixth month when I couldn't find a comfortable position. Left side sleeping is the safest, and honestly, buying a proper pregnancy pillow was a lifesaver for me. Hang in there, this phase will pass beautifully!