Ah sis, I feel you, mahirap talaga mahanap ang comfortable position pag pregnant! So far ang best for most of us is side-lying, especially left side kasi doon mas maganda ang blood flow sa baby, at least yan ang sinabi ng doctor ko. Pwede ka rin mag-use ng body pillow para sa support, sobrang game-changer talaga, isa sa mga mum friends ko literally can't sleep without hers na!
Pero honestly, bawat pregnant mommy different, so kung nag-struggle ka pa rin or may specific aches ka, mas better if you run it by your OB para ma-assess properly nila based sa kung saan ka exactly nag-hurt, yun lang. Take care, and I hope you get better rest soon!