Protozoa can be difficult to remedy depending on the species. They can be quite a challenge. Is this e histo diagnosis from the doctor in NYC?
This is what I used to fight them (lots of trial and error)
1/ Caprylic Acid
4/ Black Seed tincture
If this does not do the trick then add goldenseal leaf (not root), Nutiva hemp oil and lactoferrin. The last three items are meant to deal with resistance and biofilm.
These would also be considered anti yeast as well.