Chiropractic care is highly not recommended for folks with Chiari malformation regardless of what promises are made (painless, no manipulation, aligne the spine for optimal body self-healing…). Chiropractors do not have the medical knowledge to deal with the complexities of Chiari anatomy. There is a space occupying mass at the foramen magnum and however far the cerebellum extends into the spinal cord. A good question to think about or to ask is “Is this treatment appropriate for a tumour in the same area?”.
The Chiari head ache is tough to address as medications and traditional physical therapy typically do not help a terrible amount. (Graded motor imagery did help me after surgery. I wish I had known about it prior to surgery).
I try to challenge new Chiari folk to ask their neurosurgeon what they think is causing the head ache. To date, I have a sneaking suspicion that they don’t know. It makes it had to treat a head ache of unknown origin!
My theory on the origin is blood vessels that feed the occipital dura are compressed at the level of the foramen magnum. This causes ischemic pain in the occipital area - think referred pain. Of course, I no longer have contact with a neurosurgeon so please ask for me that I may live vicariously through you.
Good luck with managing your health and your comfort levels. Chiari truly gives a new level of challenge to life.