I hope you get some relief from the infusion, I have been getting them for over a year now and although they don't take the pain away completely they give me lots of good days. I am always out of it for a few days afterwards, although I am so tired by the time I get them that maybe it is just sheer exhaustion. The first three days I still get pain but it is only on the surface of the skin, it burns immensely and then the pain lessens.
My pain doc has seen patients whose pain has gradually disappeared and I can say one foot(which used to be my worst is now a lot better than the other).
Remember not to overdo it too much when you do feel good as the pain can come back with a vengeance, I wrote a sort of blog last year if you want to read it just look at my old threads.
I get around 3-4 weeks relief now but only have the infusions every6-8 weeks which is a living nghtmare as you know there is a treatment but in the UK I can't get access to this.