If your in the USA which I presume you are you should be able to get the med fairly easily,
A vet I presume should be able to sell you some,
Both places I found it under was for Birds/pigeons.
The two sites I purchase from are here
Located in the USA
Located in Australia I believe.
Before you think about disinfecting you need to start treatment,
3 days and 2 nights the meds need to remain in the tank,
(During this time disinfect your nets, hoses, etc.)
As I said the water may turn cloudy, that's normal,
Make sure all charcoal/carbon is removed from the tank,
(you will need to retreat again in 2 weeks time)
Once the treatment is tru you need to do a very diligent Vacuuming of the bottom substrate,
to get all fallen worms/eggs, or they can reinfect your fish again.
(This is where I prefer smaller aquariums, easier to break down and clean,)
So many people seem to have this worm come back to haunt them because they never cleaned good enough after treating,
Hot water is worthless, You need to do a good Javex water soak, Then rinse well before using.
I keep a bucket full of water going here that I soak everything between uses, approx 1/8 cup of javex to a bucket full of water is what I use, Then a Water only bucket for rinsing, Then let air dry before use. That works good for nets, syphons ornaments fake plants, gravel etc,
For cleaning the aquarium take a algae scrub brush safe for aquariums (or a clean cloth) scrub the tank clean inside and out then soak the cloth in the javex water and wash the aquarium down real good and let it set a min, Then rinse, rinse and re-rinse before setting back up.
your own hand can transfer parasites from tank to tank,
If you put your hand in a tank for whatever reason, Wash it good and rince well before putting your hands in another,
Think this is bad, Try looking at all the tanks and fish I have,
It came back on me the first time, What a nightmare! I almost gave up.
So the next time I did it I wasn't having this come back!
I treated everything as required. But instead of Vacuuming I removed every fish, 1 tank at a time put them in a holding tub, Stripped the tanks of everything so no worm got missed anywhere!
My fish slowly went back to bare tanks with just the watersprite, Slowly over several days they got their decor back as I got it disinfected.
What a headache, took me days and days to complete.