Tiki, Derpy either has severe parasites or uhm, fish TB. :( At this point, definitely try not to cross-contaminate with your other fish just in case it is TB.
Levamisol is actually one of the few medications that IS effective for camallanus worms so that drug's statement is wrong.
What you need to make medicated food is Seachem Metro or Hikari HealthAid Metro. You can order them from online. Try amazon first. If not, try kensfish.com. Shipping on kensfish will bankrupt you, though.
While you're at it, pick up some Seachem Kanaplex.
Anju most likely has a tumor and now it looks like Winnie has one too. :( Two of my three original sorority girls and they're all bloaty but only right under the ventrals, where tumors usually form.