Dear Fiona! Probably your homeopath can also help you with a cure, but anyway if you collect some samples and send it off to a lab, they should be able to identify what type of Tapeworm or/and fluke it is. From there you will be able to get the right medicine.
You said your standard stool test via your GP was normal but your homeopath diagnosed it? May i ask what test did he/she do?