A cat scan is an unusual choice for looking for CCSVI. Doppler ultrasounds done under Zamboni's protocol and MRV are the more usual options.
Would seeing Dr. Reid be an option for you? At this point in the discovery process, I see there being a real difference between the doctors who have done a number of procedures and know what they're doing and the doctors who do not. There is a learning curve.
If I were going with an IR who had not previously done this procedure, I'd want him to be in contact with IRs who have done the procedure and I'd want him to be as conservative as possible.
I also wouldn't put much faith in what the imaging has been showing. Dr. Sclafani has shared his clinical results as being 99.5% of the people with MS who he looks at with venogram and IVUS were found to have CCSVI. Only 0.5% or one case did not. So, the odds are in favor of having it. I would appear to be healthy (unless you talked to me, you might pick up on the cogfog and fatigue) but I have MS and I had 99% blockage on one side and 80% on the other. This did show up on the MRV and on the ultrasound prior to the procedure. An azygous blockage might not show up as well.
Yes, it seems to me that your response to the dives and to feeling like IBT helps you might mean that hypoxia is an issue for you. My immediate improvements, which were likely a result of hypoxia reduction, were that colors brightened, sense of taste improved, cogfog improved, the feeling of constant unwellness lifted and fatigue improved.
What do you mean by 'how can things be fixed in the head'? Do you mean, how can the jugular stenosis be fixed (via ballooning, usually at the valves)? Or how can this improve the MS that is going on in the brain?
Is the ct scan just cerebral bloodflow or did it go all the way down to the base of the neck, where the jugulars meet the subclavian vein, which is the level of where the valves are? Without the information from this area, it may not be a very useful scan.