Hi @RB709 - Welcome! I second what @Jules said. “I just despair when we hear stories on here of members like you suffering for years with neck pain etc & then we look at your CT & see glaringly obvious styloids & IJV compression.”
Like many of our members, you’ve lost the lordotic curve in your cervical spine. This changes the position of the styloids in your neck bringing them closer to nerves, vascular tissues & the C1 vertebra which in turn can increase any symptoms they are causing. The curve can be restored w/ PT &/or some gentle neck exercises. There’s even a neck orthotic which can be purchased online to help restore the neck curve - https://www.denneroll.com/cervical-combination-order. You can learn more about your neck here: List of my favourite resources on YouTube to learn anatomy
Restoring the curve won’t necessarily put all your symptoms into remission, but it can help reduce them, however, w/ the length of your styloid & their proximity to C1, I suspect you’ll need surgery both to shorten the styloids & decompress your internal jugular veins for the best overall results w/ your ES symptoms.
I’ve annotated a few of your images to help you see what we see:
