I have Venous Insufficiency and PN. My understanding of VI is that the valves no longer work in those veins so that the blood pools. I don't know the cause but some of it is related to aging as the valves wear out. The ablation just shuts off those veins and so you don't have the pooling of blood. I saw two cardiologists - one suggested the ablation procedure and one felt that if I wasn't having swelling that I could just wait and see. I chose to wait and see. I wasn't worried about the procedure - just didn't want to do it if I didn't have to.
I also have idiopathic PN in my feet and lower legs. I take Lyrica to help with the discomfort. I exercise and try to eat healthy because it's good for me in many ways but also there doesn't seem to be much to help with these two conditions.
Not sure if that helps you but let me know if I can provide any additional information. Good luck.