I am so sorry that you are not only not better off, but that you're worse off after your efforts to attempt this new therapy. I applaud you for even finding someone willing to do not just one but two angio's on you. Good for you, now THAT is tenacity!
Yes, apparently new stents for veins are in the works. Because stents can't be removed once they're put in, you might even be better off waiting until the better ones are developed, because if you have one now, you can't have the newer one put in in the same place when they're available. I don't know about the level of your progression, which may be slow at this point, even though you are already quite disabled. It's hard to make an accurate risk/benefit assessment when so little is known at this point. And this is all so new that it's very hard to know anything for certain, it's all a guessing game at this point.
There are a number of people who seem to get worse after angio and hopefully the doctors will learn more about risk factors once more research is done. It's positive that you did see some early improvements though! Hopefully your PVC's will turn out to be benign which is often the case with them. I know, I have them too!