I have had extreme vision changes with and without headache and what helped the most was seeing a vestibular physical therapist who was able to help with the muscle spasms in my neck. I also saw a TMJ specialist who made me a mouth applicant that helped relieve jaw tension. I sleep on a cervical pillow to keep my cervical spine aligned and I try to keep good ergonomics while working at my desk. Oddly these things have helped the most. In fact, during my worst vision bout, my vision suddenly cleared while she was working on my neck. Good luck. It’s difficult with we see multiple neurologists who can’t ID what’s happening