How does one treat a parasite once it has migrated to the lungs? You can't just kill it and leave it there??
I'm very sorry you're going through this... you try to be a good person and be a savior for these cats and this is the thanks you get. When I was a teenager my cat threw up worms once. He got outside for 6 hours and that quick he got something. He was laying on my bed and threw them up right between my feet.
I am petrified of throwing up now knowing I have some kind of worm infection. I would die if I threw up worms.