Extreme neck pain when walking

Extreme neck pain when walking. Does not hurt when sitting or sleeping. The only time the neck hurts when sitting is if I sit on a bench, stool, chair, etc. that does not have a back support. If I push the bottom of my chin back with my fingers when walking the neck does not hurt. The pain is affecting my daily activities such as walking for exercise, playing with the grandchildren, doing household chores, etc. I have been to multiple orthopedics, physical therapy and chiropractors. I get temporary relief but only for a short time. Any advice?