It may be gross, but shitting your pants in public is grosser!
You can order the Pig Whipworms from the company in Germany. (They want your physician's written confirmation that it will be used under his/her supervision).
The price is 500 eggs for 150Euro, 1000 eggs for 220Eu and 2500 eggs for 300Eu (1 Eu - 1.3$US).