Your doctor can send you to a sleep doctor. They will monitor your sleep and see what is going on.
In the meantime. You can buy a shirt on Amazon that has a pocket on the back that you put a tennis ball in. This forces you to sleep on your side.
Roll Over and Stop Snoring Shirt (XL) https://www.amazon.com/dp/B0784824VS/ref=cm_sw_r_cp_api_glt_fabc_NVKWETD70RZWJ3J3B1R9?_encoding=UTF8&psc=1