I'm sorry your husband is so ill. Please contact a biofeedback practitioner. A visit is usually around $80. They diagnose via frequency and can tell you which parasite(s) you're dealing with so you can then research the most effective therapy for eradication.
If you are unable to locate someone near you, I can give you the name of the lady I use in Chattanooga,TN. She's elderly and works from her home so I can't post her info publicly, but I'm sure we can figure out a way to communicate directly. She works with people around the world. All you have to do is send in a saliva sample.