I am deeply sorry for your affliction and I do understand how trying it can be. I am well aware of conditions such as filariasis which actually kills many people ever year, especially in Africa.
I also wish that I could tell you that a zapper would help but in this case, no. If it killed the worms, they would still be in your veins.
What might possibly be of help is bromelain, which digests protein, pancreatic enzymes, aspirin, and nattokinase which helps dissolve blood clots.
Keep on hand capsaicin and full flush niacin which can open up an artery if you ever get a blockage.
As for killing the worms, I would, if possible go after the larvae, and possibly try to inhibit their reproduction.
I am curious where you might have contacted these parasites
as they are mostly 3rd world.