My husband had looked into consulting in the States prior to my seeing a neurosurgeon in Calgary and subsequent surgery. I cannot remember the price, but it was daunting with travel and accommodations for at least a week. Also, just because a US neurosurgeon recommends surgery does not mean that a surgeon in Canada is obliged to operate. I do remember the USA price tag of more than $100, 000 for the surgery itself. Neither the federal nor the provincial government will subsidize any of that cost.
To clear up your understanding of your MRI findings it may be worthwhile to discuss the impact of the cerebellum in the foramen magnum/spinal canal in the sagittal plane AND the horizontal plane. Understand what those two terms are, as they are both used in determining if surgery is an option. You may have burnt too many bridges with your current medical people. Perhaps your family doctor can show you the pictures in his office or you could potentially make an appointment with a radiologist.
It seems that with your posts, you are craving a diagnosis and a neat solution. You are not alone in that desire. However, it is important to realize that surgery and medications are not the only fixes to medical problems. I wish that I had known the other the treatments options I know of now so that I could have done them when I first had symptoms!
There are diets and functional medicine doctors (present in Calgary!) to assist with auto-immune and inflammation symptoms. There is a handy assessment tool that can put one in or out of that camp. It is amazing how a diet change can help symptoms if inflammation is playing a role in presentation.
There are amazing optometrists who specialize in in vision therapy - in Calgary.
There are amazing physical therapists at Tower Physio who deal with POTS syndrome and headaches. Headaches have a variety of potential sources. Also, great new stuff has emerged with vestibular, midline, oculomotor, neurodynamics, and proprioception training.
I understand that your MRI is not normal. Perhaps you will need a decompression surgery in the future. In the mean time, there are wonderful treatments available that, when properly assessed, can make life-altering changes in symptoms. Please do not resign yourself to surgery and medication as the end all and be all to your health concerns.