The only thing there that jumps out at me is that the clots happened fast, as did the getting worse. They also resolved fast. Just because there is flow does not say much about if it is good flow or as good as it was before. A recanalized vein is not the same as a vein that never clotted.
You didn't say, do you have any more from the Barrie report, does it still show CCSVI? When considering a follow-up procedure, you might look at the report as if it were the report of someone who never had this done, if it still shows Zamboni criteria.
I'm also reminded of javabean who pursued three procedures in rapid succession but never regained her brief improvemnts after the first one. There isn't always a happy ending.
I notice we're not hearing anyone else chime in and say that they too got immediately worse like that with walking, I think it is unusual.
I am very sorry that things have gone backwards and with it so immediately after the procedure, it seems likely that the procedure is to blame.