Do you have Dientamoebae too? You may purchase the aforementioned medications from http://www.medicationsmexico.com.
I was worried about bad/fraudulent medication at first, so I had an NMR analysis run on the Secnidazole. It was legit, and I don't believe they have any reason to fake the doxycycline either. The also do a good job being discreet. You might have to wait a while, though. Hopefully you live in the US. I don't know how shipment to other countries might go.
I don't think these particular protozoans have invaded all of your body tissues, that's at least not supposed to be how they work. BUT, my whole body feels affected too. It definitely doesn't feel like JUST an intestinal problem. When the infection was first discovered, the doctors were so concerned about treating the diarrhea, but that was really the least of my worries.