Visit http://www.badbugs.org and learn everything about Blasto. and D. Fragilis (which is what I had). You will read that many people are prescribed Flagyl (Metronidazole) by the medical profession and it is all but useless against this parasite. Jackie (who runs the site) is pretty sceptical about herbs etc but one guy from Arizona who posted here last year emailed me to say he got rid of both Blasto.and DF with Clarkia . It's worth a try.
Most people with these amoebas find their symptoms worsen on eating wheat/grains/sugar and also when taking probiotics. Apparently you are feeding the parasites. Try not taking probiotics for a bit and see how you feel. Keep them for later on in the programme when you have eliminated the parasite.