Hi, & welcome to the site! So sorry that your surgery didn’t help with the IJV compression, unfortunately we’ve had a few members now who’ve been in the same position…
I’ve found some links to research articles posted by some of our very well read & helpful members which you might find interesting, seems there are several muscles which could potentially compress the IJV against the C1 process:
Omohyoid muscle and IJV compression - General - Living with Eagle
Small tricks to help Eagles with IJV compression - General - Living with Eagle
Article about jugular vein compression - General - Living with Eagle
My long journey to diagnoses of Jugular Vein Compression by Styloid & C1 - General - Living with Eagle
Hope these help!
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