I too have issue with bending. Any time my head dips down. To me it is like suffocating? There can be an explosion of pressure around the top of my head. If I hurt my neck…which can happen just from one bending down, I may also be in pain (more pain) the rest of the day. I wish I knew what is was, but I am new here too and just learning.
I wish you the best in finding an answer.