A slant pillow helped me initially and then a sleep study. I now use the slant pillow and a prescribed CPAP which I never needed prior to COVID.

I also have what we believe to be mast cell activation and take an antihistamine every day. The antihistamine does help about 50% but I still have an extremely dry nose and skin rashes aplenty. Lots of new food allergies as well...an elimination diet will help you identify those as well as the side effects you have from each newly allergic food. My side effects vary from rashes, bright red cheeks, red or swollen eyes, very painful inflamed joints, and a high tight bloated abdomen dependent on what I eat.