can you please tell us what medications were finally successful for you?
I returned from a trip to India over 2 months ago and have been sick the whole time. I was found to have Giardia a few weeks ago and was treated with 2 courses of metronidazole, which did nothing but made me feel like crap. Another test after this (with a different lab) found Giardia and Blastocystis Hominis so I was prescribed with Tinidazole. Which made me feel much better and stopped the diarrhoea for the first time in weeks pretty much straight away, but I was still having the same gurgling and rumblings in the bowels so I was prety sure that it wasn't over. After 2 courses of that a test showed no giardia but still "numerous" Blastocystis. So i took one more but it obviously didn't work as i'm right back at square one now.
I would really appreciate any more info about what your "good" doctor found and how you were treated.