I have previously had a few MRV's and dopplers performed. The first doppler performed back in the start of 2009 found a reflux in my IJV (ie only one of the 5 Zamboni criteria, not two). I then had a few MRV's which did not find any stenosis or such.
I recently had another doppler test, and they found a small difference in the amount of flow between my jugulars, and mentioned some possible stenosis around the valves. Enough for a referral for a venography 
This morning I had the venography, and they found reason to balloon both my left and my right jugulars. The surgeon said that he found some signs of reflux and ballooned it, and found this fixed it.
At the time of venogram, he said I may feel slight pressure in my neck (as he was about to inflate the balloon), but to be honest, at that point in time, I didn't feel a thing. If anything, a few seconds prior, I think I felt the "wire" (ie catheter) in my neck.
However, a few hours later, I started to notice that there was some minor discomfort in my neck when I turned it hard left or right. Nothing painful, just a sense something was "done". Sort of as if I may of slept wrong.
Anyway. At this stage, I cant say I have noticed any difference in my MS symptoms either way.
However, if I was to be looking for something/anything, I think there may be a slight difference / lowering of the amount/sense of pins & needles in the soles of my feet. But that would change all the time normally, so I am not reading anything into it.
I was not given any blood thinners before the procedure, and have not been placed on any medication after it. I only had ballooning (ie no stents). I was given a local at the catheter entry point (the inside of the left leg, as close to the groin without actually being the groin). They used an ultrasound machine to find the exact location for entry.
And of course am glad it is this way.
) in the hope the angioplasty alone would surprise me.