What could cause neck irritation on right side (pic like at times) with occasional tingling on right limbs but occurs more on left calf. tilting head down causes back pain tilting back makes pain better and tingling in calf go away if laying down. th?

I would be concerned about impingement or pressure on the spinal cord by a bulging or herniated disc in the neck. Rather than pinching a nerve root latterally, I think your symptoms suggest a central pressure directly on the spinal cord affecting your legs. I recommend consulting a neurologist or neurosurgeon for evaluation & appropriate testing.