I'm sorry that your benefits did not last longer. It sounds like you may have a problem with the size of your veins, and honestly, there really isn't much that can be done to improve that situation. Stenting a hypoplastic vein can make the situation worse in some.
The biggest "improvement" would probably be the use of intravascular ultrasound (IVUS) to guide the treatment. This allows the IRs to see what's really going on inside the veins, in real time, with real flow. There have been no real improvements in stenting. Some IRs report better success using cutting balloons.
One thing I've discussed with Dr. Cooke and Dr. Dake is that they have noted that those who are able to continue to move and exercise have better success at remaining stenosis free. This may be due to shear stress, and how strong blood flow affects the endothelium, and maintains the lining of the vessel. There has been nothing published on this as of yet. But whatever you can do to keep moving, physical therapy, water exercise, seated yoga...do it.
Another development is being made by Dr. Scott Rosa, using FONAR upright MRI. He is finding that many pwMS have problems with the atlas which is contributing to venous outflow difficulties. He is documenting how cerebrospinal fluid moves better and has less reflux after adjustments of the atlas. I do believe CSF is going to be studied in closer detail. BNAC has recently published and presented research at ECTRIMS and ISNVD on the improvement in CSF flow speed, which continued a year after venoplasty. Slowed CSF is a known problem in neurodegenerative disease.
I wish I had better, more concrete news to give you. With progressive MS, you do not have years...and that must be frustrating. Make sure to do all you can to live a vascularly healthy lifestyle-limit stress, eat whole foods, don't smoke, move as much as you are able, supplement with vitamin D and eat healthy fats, like omega 3. I'm sure you know all of this...but it's always good to go over it. (I need to remind myself and Jeff every day
Always talk all of this over with your doctor.
It's good to hear from you. Keep checking in,