I’m UK, I had bilateral IJV compression, but it was just by the styloids, not the C1. I was very lucky & the first surgery helped my vascular symptoms very quickly, I had a year between surgeries, that was about 9 years ago. If I get very stressed, or fly then I get a bit of head pressure again, but the surgery was successful. I would never have found out about the surgeon if I hadn’t read about him on this site.
I’m sorry that you’ve not been helped by your surgeries so far 
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