My client was given a Lightworker Healing Protocol session for divine healing but still feels a spirit stuck in his physical body, in his head and neck, and carrying a feeling of doubt. Was he fully cleared and what is the reason for this persisting problem?

His Protocol session was successful. This is persistence of the former problem still there as cellular memory, and has not been fully eliminated as yet. You gave him the proper advice previously, seeing intuitively there were still symptoms and the reason why. You can reassure him you are sending extra healing because that is true, the Protocol will be doing that automatically, and that the sensations will slowly fade over time and to be patient. This is the best one can do under such circumstances. The healing simply will take time.