@DogLover One thing I would like to ask you is when they found brachiocephalic vein compression did they rule out any subclavian artery issues (I assume they did since you went through Catheter Angiogram). The reason why I am asking is, there little known condition called craniovascular hypertension thoracic outlet syndrome (TOS CVH) which causes increased hypertension in the brain. This is explained well in MSK Neurology site posted here (New paper associating vascular ES with IIH)
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