Instead of talking about stenosis, it's more inclusive to talk about "outflow obstructions" which includes the occasional case of narrowing, the frequent cases of valve malformations which sounds like what you had, poor development of the veins, completely absent veins, a bone obstructing into a vein...you get the idea.
Without a better description from the doctor, it's hard to say, but I'd expect a "stuck valve" found in a pwMS to be exactly what we're talking about when we talk about CCSVI. My own doppler showed a bad but moving valve on my right side and a giant big immobile valve on the left. I am looking forward to getting both of them ballooned, perhaps I'll get some of that energy you're talking about.
That's interesting about having the neuro questionnaires even at 1- and 2- weeks and then every month. That's looking very soon after the procedure and lots of data, if only self-reported. It's possible that 3 weeks is a time when improvements are lost if the vein was underdilated in the first place so maybe we'll learn more about that if the docs focus on the early time period post-procedure.