Yes, I had Blastocystis Hominis over the summer; took me 3 months plus to get over it. This issue caused a flare-up of candida overgrowth.
These are the different things I tried:
1)Grapefruit seed extract helped to keep the blasto tolerable, but it never killed it off completely. I used this in between the different things that didn't work. It was the only way I could get from day to day in a half way normal manner.
2) Metronidazole (Flagyl) - an antibiotic. After taking half the Rx I got carpal tunnel in my left wrist and had to quit.
3) Yodoxin - Developed eye problems, had to quit.
4) Alinia (Nitazoxanole) - After 6 pills of this I did not show a recurrence of blasto. Although I did have quite a battle with candida, which I was aware I would have. This was better than battling the blasto.
For diarrhea my doc Rx'd Cholestrymine. It's a powder you mix with water. You need to drink a lot of water all day because it binds with impurities and draws them out of your colon. If you don't drink a lot of water you get constipated. But this stopped my diarrhea right away, this and the grapefruit seed extract.
After I showed no blasto, tested by looking through microscope at urine by my holistic M.D., he said my urine showed an over abundance of serotonin.
For this he said I should do a regimen of grapefruit seed extract, bioflavonoids, and a homeopathic liquid he made up (sorry, don't know what this is). If you want to know what this is, I can find out. I am much, much better now, almost normal.