Thank you very much Mattk!
This helps a lot.
Do you think it's because flukes damaged our liver function(assume it's liver fluke, but I also suspect mine is intestinal fluke) so drugs we've taken couldn't have their full effects? Have you ever tested positive for flukes and how should I confirm I have it? A lot of people are doing eniemas to dislodge flukes, have you done that and do you think it's necessary?
Just ordered some praziquantel and will start to take it soon.