I hear your frustration! I don't believe fasting alone will kill parasites... It may eliminate some, but I think they are designed to outlast us. I used to wonder how worms got in a casket... then I learned that we take them in with us!
You should take parasite killing herbs when fasting or not. Lots of good things can happen to the body on a fast. I am convinced that juice fasting is a healthy fast. In my opinion, Water Fasts release toxins to quickly and make it difficult for the body to handle If its done at all it's probably better left to the end of the fast. I really haven't made up my mind about the MC.
It takes a while to get rid of worms, a good diet that kills them and makes an unwelcome envirement for them, and consistant herbs or protocols that kill them.
a lot of people have success with Humaworm, ZymexII. Be sure to follow the directions that come with the protocol.