Hi mubashir313,
I have been in the market for a long time trying to choose the best pillow for side sleeping and neck pain. I also researched health websites and consulted experts. The products that David Rubin and I previously mentioned were failed by my doctors and experts. Here are the products I have chosen for myself and my entire family.
For Side Sleeper:
DreamyBlue Signature Side Sleeper Pillow w/Adjustable Loft
https://www.amazon.com/DreamyBlue-Premium-Pillow-Sleeping-CertiPUR-US/dp/B09ZKFK4JD/
Coop Home Goods Original Crescent Adjustable Pillow for Side Sleeper
https://www.amazon.com/Coop-Home-Goods-Crescent-Sleeper/dp/B0BGQ8VWRJ/
**For Neck Pain:
Osteo Cervical Pillow for Neck Pain Relief**
https://www.amazon.com/Osteo-Cervical-Odorless-Adjustable-Orthopedic/dp/B09964WTF5/
C CUSHION LAB Deep Sleep Pillow, Patented Ergonomic Contour Design for neck and Shoulder Pain
https://www.amazon.com/Patented-Ergonomic-Sleepers-Orthopedic-Cervical/dp/B099QTDNTW/