Hi Rissi. You are on medication that will have a very good impact on reducing these microbes, however, there are immunologic factors to consider.
What lead you to this treatment? Did you have absolute confirmation about intestinal protozoa?

My experience has been that this is a multifaceted problem, often with blood cell\tissue involvement.
The protozoa in the gut are mostly nuisance parasites which alter gut microbiota, and cause itchy bum. In more sever cases, there is acute digestive upset which can last for years.
Can you write down all your symptoms? Take your time, because details are very important in these cases.
Do you have any past blood work etc. that you can get access to? Shroom

I am guessing you got the drug advice from Jackie's site http://www.badbugs.org?
She's the most up to date source of information for this parasite. I had dientamoeba fragilis so took different drugs to you but the diarrehia went which was the most important thing. And I tested clear after. Some people contacted me who took your drugs for blasto. They had varying degrees of die-off.

Probably the single most important thing is to clear your bowels. I had colonics before, during and after the drug treatment. It made a huge difference. If you have not done colonics before then you might be apprehensive and could try something like Oxypowder (have not taken it myself but people recommend it). If you tend to have diarrehia with Blasto (intermittant) you might think you are cleared out but I can assure you, you are not!

Can you tell us what your die-off issues are? If you clear your bowels you will be amazed at the different. My die-off was massive fatigue. I had to stop driving and go to sleep in the back of the car at one stage. But the die-off was bearable (because of the colonics?). Yours clearly isn't.

Did you get through the treatment? How do you feel now? I'm considering it myself.