My neck pain and headaches have been getting worse lately, and I noticed that they are significantly worse when I am upright for longer periods of time. I also started getting headaches that are either (or possibly both) occipital neuralgia or trigeminal neuralgia. After some research, I discovered that sometimes these symptoms can be due to craniocervical instability (CCI) which is common in people with connective tissue disorders. To see if CCI is causing any problems, they use an upright MRI.
I talked to my neurologist about it, and he agreed an upright MRI could show us something that my supine (flat on my back) MRI had not. He found a place nearby that did them, and filled out the orders for me.