Years into the parasite
removal process, I discovered I had a gigantic fluke.
They bury through intestine, live in cavity, jump between organs.
Easy to ID, Praziquantel sensitive, Levamisole a player as well.
Took some high doses and time to kill them, I had a few.
Smaller and various flatworms eliminated long time ago, to to id and kill such a strange flatworm, that is large, and can bite with pain. Feed by getting blood from organs, so they are able to inflict a surprise when upset with their food supply of meds.
Thought this might help you identify the critter.