Helmenthic horrors

I'm not usually grossed out but this one did it for me.  A couple items before the gory details.  I like to use a saline rinse to keep the old nasal passages clean and open.  Next, the drinking water source for where I'm living is rain water collected from the roof and stored in a 500 gal size tank.  I've been assured this is clean water is not to worry - in fact, I drank from it for two months last year without any problem.  I like to use bottled water for the nasal rinses just to be sure.  Last night I am showering when I look at the bottle I use for this purpose and I see something crawling.  A closer look and I see multiple parasitic swimmers inside the bottle.  It appears I may have switched drinking bottles with rinsing bottles and have been filling my sinuses with some flagellating organism.  Hmmm, will these creatures invade my brain and cause some delusional activity and will anyone notice the difference?  Or, will they just set up business in my GI system reeking havoc there?  Fortunately, I have access to deworming and amoeba medications at the clinic.  Guess who the first patient is going to be?