Your issue is a little clearer t me now. The parasites are in your lungs. Eggs in your lungs hatch and come up in phlegm and get swallowed to your GI track. It's a natural life cycle for many types of worms.
My lungs were so plugged at one time I had to buy an oxygen generator. You are right. Your only option is lots of meds. I did find that H2O2 (Hydrogen-Peroxid) did help.