Suggest going to a private physio who can give you ample time and assessment. Head movement vaires the tension distally in the spine so perhaps one of the bulges is large? Also L4 L5 bulges will still give you distal leg pain, even sciatic. Often that is due to secondary compensatory strategies in the body such as piriforim and pelvic issues. Overall you need further assessment and I would not wait for to long.